Detection method and system for vehicle motion

The invention discloses a detection method and a detection system for vehicle motion. According to the system, a gravity acceleration sensor is arranged on the axle of any wheel of a vehicle; the gravity acceleration sensor is used for acquiring accelerations in the x direction, the y direction and the z direction in a wheel running process; then a micro control unit judges whether the wheels do circumferential motion according to the change of the accelerations in the x direction, the y direction and the z direction; if the wheels do the circumferential motion, the number of turns of running of the wheels is further counted and is sent to a data acquisition unit through a first wireless communication interface on the micro control unit; a second wireless communication interface of the data acquisition unit receives the number of turns of running, and the running speed and the running distance of the vehicle are calculated according to the number of turns of running of the wheels and wheel parameters, so that the running speed and the running distance of the vehicle can be accurately detected.