On-line dynamic testing equipment for shape and size of rolling stock wheel set

The utility model discloses an on-line dynamic testing equipment for shape and size of rolling stock wheel set, wherein, camera units are arranged on the ballast areas of both inner and outer sides of a track; a wheel detector is arranged on the inner side of the track near the camera; a proximity sensor is arranged on the side of the track in front of the camera unit; a departure sensor is arranged on the side of the track behind the camera unit; the wheel detector, the proximity sensor and the departure sensor are all connected with a data processing and control equipment. The equipment can realize the on-line dynamic test of wheel set shape contour and various size parameters in the operation of various rolling stocks, needs no transformation on prior rail structure when in use, permits the velocity of a moving train up to 30km/h when in measurement to realize dynamic test, and can make all-weather unattended automatic test with high testing accuracy.