Winch test platform and test method thereof

A winch test platform comprises a load assembly and a transmission assembly. The load assembly comprises a load end and a power supply assembly, the load end comprises a load driving motor and a large chain wheel which are vertically connected, and the large chain wheel rotates around the circle center; the transmission assembly comprises a small chain wheel and a transmission shaft which are vertically connected, the transmission shaft is provided with a torque sensor and a flexible coupling, and the flexible coupling is connected with a connecting shaft on the side wall of the tested winch; the small chain wheel is connected with the large chain wheel through a transmission chain and rotates around the circle center of the small chain wheel. During application, firstly, the connecting shaft is connected with the flexible coupler, then the tested winch is fixed and then started, then the power supply assembly supplies power to the load assembly, then the rated torque of the load end is set, then the tested w