The invention belongs to the field of detecting equipment design, and especially relates to a force measuring platform for an underwater thruster. The force measuring platform for the underwater thruster comprises a force measuring device, a battery set, a transfer rod, an operation platform, a water tank, a control module, a connecting base, an underwater thruster and a connecting shaft. The force measuring device comprises a base, a cushion block, pressure sensors, an upper-layer sliding block, an upper-layer guide rail, a lower-layer sliding block, a lower-layer guide rail, an upper-layer guide rail base and a force measuring rod. The force measuring platform for the underwater thruster is characterized in that the force measuring platform for the underwater thruster also comprises a steering engine, a steering engine base, a steering engine flange, a middle flange and a shaft end flange, and the number of the pressure sensors is four. In the working process, zero adjustment is performed on the pressure sensors, the turning angle of the steering engine is adjusted and the hydrodynamic force parameters of the underwater thruster are measured in real time through the control module. According to the invention, the hydrodynamic force parameters of the underwater thruster when water flow direction changes under a real working state are measured, the force measuring platform is simple in structure, is convenient to operate, is suitable for measurement of the mechanical property of the underwater thruster and is low in measuring cost.