The invention discloses a motor for underwater work, which comprises a casing, a stator and a rotor are arranged in the casing, an output shaft is interspersed in the rotor, and the output shaft is rotatably connected to the inner side wall of the stator. One end of the stator passes through the side wall of the housing through a bearing, and vertically arranged bar-shaped cavities are symmetrically arranged on the side wall of one end of the housing, and each of the bar-shaped cavities is equipped with a check valve at one end close to the output shaft. The end of the bar-shaped cavity facing away from the output shaft is fixedly connected with a heat conduction column, and a pressure valve is installed on one side of the heat conduction column, and the pressure valve is located in the stator. The present invention can change the aqueous solution into gas and spray it out from the slit through the interaction of the airflow ring, pressure valve, one-way valve, heat conduction column and other structures, and can discharge the aqueous solution in the slit to the shell along the airflow outside, so that water will not flow into the casing along the slits, thereby protecting the motor well and increasing the service life of the motor.