Description Electric Remote Control Golf Trolley Technical Field The invention relates to an electric remote control golf trolley. Background of the Invention Generally, conventional golf trolleys are pushed by man power or driven by electricity. After hitting a golf ball away for a certain distance, a user needs to walk back to the position where the golf trolley is parked to push or operate the golf trolley to go ahead. Walking back and forth like that causes a physical burden for the user. Therefore, the use of the conventional golf trolleys is inconvenient. There are also self-walking type electric remote control golf trolleys. But such self-propelled type electric remote control golf trolleys have the problems as follows: as no support is provided on the back part of the frame, the golf trolley is likely to turn over when walking uphill due to backwards displacement of the gravity center of the golf trolley, the use is inconvenient; on the other hand, the front wheel is in a single wheel structure with a small contact area with the ground, so that the golf trolley propels unstably, and the golf trolley is likely to turn over towards one side during propelling. Summary of the Invention The purpose of the invention is to provide an electric remote control golf trolley, which is reasonable in structure, stable in running, not easy to turn over and convenient in use. The above technical purpose of the invention is mainly achieved by the technical solution as follows. An electric remote control golf trolley is provided, 1 comprising a frame, a left main wheel and a right main wheel respectively arranged on two sides of the frame, a handle fixed with the frame and a driving motor controlled by a remote controller. A front end of the frame is provided with a front wheel group, and the front wheel group includes two coaxially symmetrical front wheel bodies. A rear end of the frame is provided with a rear wheel group, and the rear wheel group includes two coaxially symmetrical rear wheel bodies. The rear wheel group is added for supporting the rear part of the frame, when the gravity center of the golf trolley displaces backward when the golf trolley propels uphill or by other reasons, the rear wheel group supports the golf trolley, thereby preventing the golf trolley from turning over; on the other hand, by adopting a structure of two coaxially symmetrical front wheel bodies and rear wheel bodies for the front wheel group and the rear wheel group, the contact area between the front and rear wheel groups and the ground is increased, thereby improving the propelling stability of the golf trolley. Based on reasons from the above two aspects, the remote control golf trolley of the invention overcomes the disadvantages of the existing non-remote control golf trolleys, and meanwhile, the remote golf trolley is stable in propelling, not easy to turn over and convenient in use. Preferably, a rectangular frame is arranged in the middle of the frame. The rectangular frame is provided to be convenient for assembling and disassembling a storage battery supplying electricity to the driving motor. Therefore, the invention is characterized in that it is reasonable in structure, stable in propelling, not easy to turn over and convenient in use. Brief Description of the Drawings Fig. 1 is a three-dimensional structure diagram of the invention; Fig. 2 is a three-dimensional structure diagram of the invention in view of another angle; and, Fig. 3 is a side view of the invention. 2 Detailed Description of the Invention The technical solutions of the invention will be further described in details as below by specific embodiments with reference to drawings. Embodiment 1 As shown in Fig. 1, Fig. 2 and Fig. 3, a handle 4 is fixed with a frame 1, the handle 4 comprises a lower handle 5 and an upper circular handle 6, the upper circular handle 6 is hinged with an upper end of the lower handle 5, and the upper end of the lower handle 5 is provided with a locking notch; a slide groove 7 is arranged on the upper circular handle 6, a slide pin 8 is provided in the slide groove 7, and the slide pin 8 may enter into the notch on the upper end of the lower handle 5 under the action of an elastic element to lock the lower handle 5 and the upper circular handle 6 tightly; a rear bag carrier 9 is arranged on a position of the lower handle 5 approaching to the upper circular handle 6; and, a rectangular frame 10 is arranged in the middle of the frame 1, two sides of the frame 1 are respectively provided with a left main wheel 2 and a right main wheel 3, and inner sides of the left main wheel 2 and the right main wheel 3 are respectively provided with a left driving motor 16 for driving the left main wheel 2 and a right driving motor 17 for driving the right main wheel 3. A front wheel carrier 11 extending frontward is arranged on a front part of the frame 1, a front end of the front wheel carrier 11 is provided with a front wheel group 12, the front wheel group 12 includes a front wheel body 121 and a front wheel body 122, which are coaxially symmetrical, and a front bag carrier 13 is arranged on a position of the front wheel carrier 11 approaching to the front wheel group 12. The rear part of the frame 1 is provided with a rear wheel carrier 14 extending backward, a rear end of the rear wheel carrier 14 is provided with a rear wheel group 15, and the rear wheel group 15 includes a rear wheel body 151 and a rear wheel body 152, which are coaxially symmetrical. 3