Seat plate body assembly positioning tool of poison filtering and ventilating device

The utility model relates to a poison filtering and ventilating device, in particular to a seat plate body of the poison filtering and ventilating device, and aims to provide a positioning tool for a seat plate body assembly of the poison filtering and ventilating device. The tool comprises a bottom plate with the same shape and size as a seat plate body, a positioning pin and a positioning clamp for positioning and clamping the bottom plate and the seat plate body, the bottom plate is provided with two first strip-shaped holes which are respectively used for placing and positioning the two lower clamping hoops and are matched with each other, a square hole which is used for placing and positioning two supporting legs of the fan bracket, and a round hole which is matched with the ventilation hole in the seat plate body, and the positioning pin sequentially penetrates through the round hole and the ventilation hole. According to the tool, the positioning process is simplified, the original manual marking posit