Railway vehicle wheel set measuring instrument and measuring method

The railway vehicle wheel set measuring instrument comprises a main transverse plate, a convenient adjusting mechanism and a central control processing mechanism are fixedly installed at the top of the main transverse plate, an infrared generating mechanism is fixedly installed at the bottom of the main transverse plate, and the convenient adjusting mechanism comprises an auxiliary transverse plate. According to the equipment, a plurality of cooperative parts are additionally arranged on the basis of the prior art, a frame structure is divided into two parts, meanwhile, the equipment adopts an electric driving operation mode, the equipment use difficulty is reduced, the equipment can adapt to various rails with different intervals, the equipment is convenient to use, and the equipment is convenient to use and high in practicability. The problem that an independent device cannot measure the distance between tracks of various different sizes due to the fact that an existing device is single in internal structur