High-power and heavy-load back-to-back planetary gear test platform

A high-power and heavy-load back-to-back planetary gear test bench for full speed and full loading testing, which solves transmission shaft's high processing cost problem and the inability to test in a simulated environment, includes a driving device, first and second shaft couplings, a speed increaser, a speed and torque meter, a back-to-back planetary gearbox closed power system, a clamping groove body coaxially sleeved on an axial positioning protrusion, a clamping component embedded inside an axial positioning groove, and a shaft segment coaxially installed on the clamping groove body to provide an axial displacement by the clamping component to tightly clamp the clamping groove body and the axial positioning protrusion, therefore the clamping groove body generates a radial displacement under an axial pushing of the clamping component and is expanded in the radial direction to tightly connect with the axial positioning groove; and a marine test component for marine environment simulation.