Hopper door

The utility model discloses a hopper door which comprises a door body (5). The hopper door is characterized in that the door body (5) is connected with a hydraulic driving device (1) by a connecting pull rod (2) and can be opened and closed under the driving of the hydraulic driving device (1); and a pull rod protecting pipe (3) is arranged at the outer part of the connecting pull rod (2). Compared with prior art, the hopper door has the advantages that the door body is connected with the hydraulic driving device by the connecting pull rod and can be opened and closed by the driving of the hydraulic driving device, the pull rod is protected by the pull rod protecting pipe, can not suffer from the resistance of sediments of a spoil hopper, and can not be bent, so that a sealing ring between the door body and a cabin does not need to be maintained, only the door body needs to be opened, and the hopper door does not need to be wholly disassembled.