Device for preventing propeller of small-scale high-speed ship from becoming loose

The utility model provides a device for preventing a propeller of a small-scale high-speed ship from becoming loose. The device comprises a propeller shaft, the propeller, a propeller fastening nut, a washer, a stop bolt, a stop baffle plate and a stop snap ring, wherein the propeller fastening nut is arranged on a shaft head of the propeller shaft which is fixedly connected with the propeller, a ring groove is formed in the tail end of the propeller fastening nut, the stop bolt is screwed into the shaft head of the propeller shaft in the ring groove through the washer, the stop baffle plate is arranged in a clamping way by clinging to the cap of the stop bolt and pushes against the stop bolt, and the stop snap ring is arranged on the outer side surface of the stop baffle plate. The stop snap ring is embedded and clamped in the ring groove formed in the tail end of the propeller fastening nut. The device has the benefits that the propeller fastening nut can ensure that the propeller is fixed on the propeller