Diving slurry pump

The utility model provides a diving slurry pump, which comprises a coaxial motor, a water pump and a sealing device positioned between the motor and the water pump. The sealing device comprises an oil chamber, a rear pump cover, a mechanical seal and a mechanical seal base, wherein the rear pump cover is fixed at the bottom portion of the oil chamber; the lower end surface of the rear pump cover is fixedly connected with the mechanical sealing base sleeved on a shaft; and the mechanical seal installed on the upper end surface of the mechanical seal base is positioned inside the oil chamber. The diving slurry pump is characterized in that the mechanical seal positioned inside the oil chamber adopts two single end surface mechanical seals pressed between the oil chamber and the mechanical seal base; an oil chamber outer mechanical seal additionally arranged is pressed between the lower end surface of the mechanical seal base and an impeller of the water pump; and auxiliary impellers are omitted, thereby resolvi