The invention provides a waterproof baffle plate, including a front wall and a back wall which place vertically, and a vacuum is equipped between the back wall and the front wall. Front riser vent group is equipped on the front wall. The back riser vent group is equipped on the back wall. The heights of the back riser vent group on the waterproof baffle plate and the front riser vent group on thewaterproof plate are the same and the locations of that are crossed. The waterproof plate also includes a front baffle group and a back baffle. The front baffle group is fixed on the front wall and between the front wall and the back wall extrudingly. The front baffle group includes a main baffle, which includes a forepart which is fixedly connected with the front wall and an inclined backpart towards one side of the front riser vent group. The back baffle is fixed on the back wall, and between the back wall and the front wall extrudingly, the back baffle is located on the side of back riser vent group near the front riser vent group. The back baffle is fixed on the back wall, and between the back wall and the front wall extrudingly, the back baffle is located on the side of the back riservent group near the front riser vent group, and is located on the side of the main baffle near the front riser vent group. The waterproof baffle plate can be used as a cabinet door structure or a wall structure of waterproof machine, and has a good waterproof performance.