Robot RV speed reducer transmission error precise testing device

The invention relates to a robot VR speed reducer transmission error precise testing device. The device comprises a speed reducer bracket, a speed reducer mounting flange fixedly arranged on the speedreducer bracket, and a RV speed reducer fixedly on the speed reducer mounting flange; an input shaft with an input circular grating and an output flange shaft with an output circular grating are correspondingly arranged at an input end and an output end of the RV speed reducer; an input circular grating reading head and an output circular grating reading head are correspondingly arranged at the lower sides of the input circular grating and the output circular grating. By arranging the circular gratings at the input end and the output end of the speed reducer and reducing the transition connector between each circular grating and the speed reducer, the measurement precision is further improved, the error caused by adding more transition connector is reduced, the testing cost is reduced, the testing device is more