Underwater propeller with high heat dissipation performance

The utility model relates to the field of underwater propellers, in particular to an underwater propeller with high heat dissipation performance, which is characterized in that a duct fixed on a ship body is connected with an underwater motor, a propeller hub shell is connected with a rotor shell of the underwater motor, and along with the operation of the underwater motor, the propeller hub shell and the rotor shell synchronously rotate to drive blades to rotate; the motor base and the duct are integrally formed and coaxial, and the motor base is connected with a main shaft of the underwater motor and used for fixing a stator winding on the main shaft of the underwater motor; the control circuit board is in bolted connection with the motor base; the fairing is buckled with the edge of the motor base to form an inner cavity used for protecting the control circuit board, a first drainage opening used for seawater circulation is formed in the side wall of the fairing, and sealant is injected into the inner cavi