The utility model discloses a portable dynamic weighing device of vehicle based on radio transmission technology, including piezoelectric film sensor, processing circuit, signal acquisition circuit, wireless transparent transmission module and the power module who connects gradually, piezoelectric film sensor, processing circuit and signal acquisition circuit all with power module connects, the piezoelectric film sensor is pasted at road surface. The device has sensor simple to operate, changes simple advantage, has obviously improved the suitability of device, and simultaneously, the device adopts high energy density's lithium cell to maintain the operation of system, need not the external power source power supply, can satisfy site operations's requirement, and in addition, the device adopts wireless transparent transmission's information transmission mode, has realized the automatic operation of system, has improved the axle and has carried register for easy reference simple to operate 0.