Waste gas purification device

The waste gas purification device comprises a box body (2) and a tank body (5) which are communicated with each other, a sealing door (3) is arranged at the front end of the box body (2), a strip-shaped clamping groove (10) is formed in the lower inner wall of the box body (2), the strip-shaped clamping groove (10) is perpendicular to the sealing door (3), and the width of the clamping groove is matched with that of a filter screen (11); a fixing component (4) is arranged on the outer wall of the box body (2), the fixing component (4) is provided with a fixing shaft (43) extending into the box body (2), the top of the filter screen (11) is provided with a fixing hole (111) allowing the fixing shaft (43) to be inserted therein, and the fixing shaft (43) can be inserted into or withdrawn from the fixing hole (111) by operating the fixing component (4). The box body is provided with the fixing part and the strip-shaped clamping groove, rapid disassembly and assembly of the filter screen are achieved, the circula