Harmful substance detecting and filtering device for waste gas purification

The utility model discloses a noxious substance detecting and filtering device for waste gas purification, which comprises a waste gas purification box, the left side of the waste gas purification box is provided with a spraying chamber, the right side of the waste gas purification box is provided with a lifting assembly, and the inside of the spraying chamber is movably connected with a spraying frame through the lifting assembly. The outer side of the spraying frame is fixedly connected with a scraping plate, and one side of the scraping plate is connected with the inner wall of the spraying chamber in an attached mode. By adopting the structure, when the filter element needs to be replaced, the lifting cylinder is started and drives the guide block to move in the guide groove, and the guide block is connected with the mounting frame, so that the mounting frame can be moved out of the purification pipe, and then a worker can disassemble and replace the filter element on the mounting frame; after replacement