Device for testing performance of speed reducer

The utility model provides a device for testing the performance of a speed reducer, and the device comprises a workbench, a speed-regulating motor, a supporting plate, a clamping cylinder, and a control cabinet. The speed-regulating motor and the supporting plate are respectively disposed on the workbench. The speed-regulating motor is connected with a shaft coupler. An installation hole is disposed at a position, corresponding to the shaft coupler, on the supporting plate. The clamping cylinder is disposed on the supporting plate and passes through the supporting plate. An end part of the clamping cylinder is movably connected with a press plate. A working surface of the supporting plate is provided with two positioning pins. The bottom end of the supporting plate is provided with an auxiliary supporting object which is fixed on the workbench. The supporting plate is provided with a control valve which controls the clamping cylinder. The control valve and the speed-regulating motor are respectively in electr