The utility model provides an underwater propulsor's test platform, including the test jig that is used for installing underwater propulsor, install on the test jig: the fixing base, including the dynamometry lever, the dynamometry lever is rotationally installed through the pivot of passing the pole body on the fixing base, the one end of dynamometry lever is used for the installation underwater propulsor, the other end with be provided with force transducer between the fixing base, drive power supply provides operating voltage, the control unit, control test?procedure, and according to force transducer's numerical value obtains underwater propulsor's thrust size. The utility model discloses synchronous measurement is carried out to the power that can produce voltage, electric current, power and the propeller of underwater propulsor during operation. Whole test platform simple structure, assembly and disassembly is convenient, and work safe and reliable can measure the propeller performance index of multiple model.