Waste gas treatment device convenient to install

The utility model discloses a waste gas treatment device convenient to install, which relates to the technical field of waste gas treatment devices and comprises a tank body, the lower end of the tank body is communicated with a gas inlet pipe, the upper end of the tank body is of an opening structure, a positioning plate capable of moving up and down is arranged in the tank body, and a gas outlet is formed in the middle of the positioning plate in a penetrating manner. A filter element covering the air outlet is arranged at the lower end of the positioning plate, a positioning flange is arranged on the inner wall of the tank body, a sealing assembly is arranged between the lower end of the positioning plate and the positioning flange, a locking assembly located above the positioning flange is arranged on the side wall of the tank body, and the locking assembly can transversely and telescopically move; when the positioning plate moves downwards, the locking assembly can contract, and after the positioning pla