Crushing device for underwater cleaning

The utility model relates to a crushing device for underwater cleaning, which comprises a fixing plate and a crushing mechanism, and the crushing mechanism comprises a crushing bin, a crushing cutter, a crushing motor and a transmission assembly; the crushing bin is detachably connected to the lower portion of the fixing plate, the two ends of the crushing bin are open, the crushing cutter is rotationally arranged in the crushing bin, cutting and crushing are conducted through the crushing cutter, and the crushing cutter comprises a cutter shaft, blades and a limiting pipe; the cutter shaft is sleeved with blades and limiting pipes, the blades and the limiting pipes are arranged in a staggered mode, and the blades and the limiting pipes are clamped with the cutter shaft to rotate together; a smashing motor is arranged above the smashing bin, a motor waterproof cover is arranged outside the smashing motor, a transmission assembly is arranged between the smashing motor and the cutter shaft for connection, the t