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A kind of integrated flow sensor which comprises a branch micro channel as the measuring channel; a floating micro bridger made by the micro-mechanic technique to across the branch micro channel and vertical to the flow direction. There allocates a thin film layer of heater, thin film layer for heater temperature detector, and the insulation layer in between which are all above the micro bridge. By the formed Wheatstone bridge, the flow of detected liquid can be measured. Through decision of the section area of branch micro channel, the impedance of fluid is adjustable. Furthermore, to create the liquid temperature detector employing the same structure of thermal flow sensor, so that no matter the flow direction of liquid, the flow can all be measured.