The invention relates to a mud removing device for a fully-submerged rotary disk filter. The mud removing device comprises an
aeration device arranged in a central
rotating drum of the rotary disk filter and a
mud pump arranged outside a rotary disk. A main
pipe of the
aeration device is fixed on a central axis of the central
rotating drum; the input end of the main
pipe is connected with an external
air pump; the main
pipe is provided with a plurality of uniformly distributed
branch pipes; and air holes are densely distributed on the
branch pipes. During work, the
air pump is started to pump normal pressure air into the
aeration device, the air passes through the main pipe and enters the
branch pipes, and aeration is realized through the micropores uniformly distributed on the branch pipes; in the multi-stage
air channel system, air is effectively depressurized and forms uniform small bubble curtains, and the bubble curtains float and raise to pass through rotary disk filter cloth from interior to exterior, so that the
sludge deposited on the outer surface of the rotary disk filer cloth is effectively washed away from the filer cloth; and at the moment, the
mud pump is started for suction, the
sludge and impurities separated from the surface of the filter cloth can be effectively sucked away, so that the
sludge is efficiently removed and the filter function of the rotary disk is restored.