Pool bottom dredging device

The invention discloses a pool bottom dredging device comprising a closed shell. A walking wheel set capable of walking at a pool bottom is installed at the bottom of the closed shell. A sludge pump is fixedly installed in the closed shell. The inlet end of the sludge pump communicates with a sludge suction pipe. The sludge suction pipe extends out from the closed shell, and the sludge suction end of the sludge suction pipe is close to the pool bottom. The sludge pipe and the closed shell are matched in a sealed manner. The outlet end of the sludge pump communicates with a sludge outlet pipe. The sludge outlet pipe is a hose and extends out from the closed shell. The sludge outlet pipe and the closed shell are matched in a sealed manner. By means of the pool bottom dredging device, pool bottom silt removal can be executed in the normal operation state of a contact pool, the contact pool is not emptied any more, and the work efficiency is improved; and furthermore, personnel are not arranged to go into the poo