Performance test bed for outboard engine assembly

The invention relates to a performance test bench for an outboard engine assembly, and belongs to the technical field of engine performance test. The performance test bench comprises a test bracket, adynamometer for testing the performance of an outboard engine assembly, an outboard engine assembly fixing device and a connecting water seal system of the outboard engine assembly and the test bracket, wherein the outboard engine assembly is installed on the outboard engine assembly fixing device, and an output shaft of an outboard engine propeller penetrates through the connecting water seal system through a transmission shaft to be connected with the dynamometer. The whole set of water seal system is designed, universal shaft connection is used, and the outboard engine assembly adopts a three-dimensional flexible fastening scheme, so that the transmission shaft between the output shaft of the propeller and the dynamometer is prevented from being soaked in water for a long time, the requirement on centering deg