The invention discloses a filter cloth high-pressure automatic flushing apparatus for a vacuum belt conveyor. The apparatus comprises guide rails, a direction guiding slot, limiting devices, a nozzledevice, a moving trolley, a movable sleeve, a high-pressure flexible tube and a high-pressure pump; the guide rails and the direction guiding slot are fixedly mounted on the frame of the vacuum belt conveyor in parallel, and the direction guiding slot is located between the two guide rails; the limiting devices are respectively arranged at two ends of the guide rails; the moving trolley comprisesa box body and pulleys capable of moving on the guide rails; one end of the movable sleeve is connected with the sidewall of one end of the box body, the other end extends along the flow guiding slotand is laid in the groove of the direction guiding slot to form a through slot for the high-pressure flexible tube to go through, and the movable sleeve and the high-pressure flexible tube in the movable sleeve can be upwardly rolled up in an arc-shaped manner from the internal of the groove of the direction guiding slot or be spread into the groove with the reciprocating movement of the moving trolley; and the nozzle device is fixedly mounted on the outer sidewall of the box body.