Waste gas purifier

The utility model relates to a waste gas purifier which comprises a purifier body, wherein a gas inlet pipe is arranged on the upper end of the purifier body, and is connected with the upper end part of a filtering pipe inside the purifier body through a flange plate, the filtering pipe has an S-shaped structure, a branch pipe communicated with the filtering pipe is arranged on the lower end of the filtering pipe, the lower end of the branch pipe is connected with an outlet, a valve is arranged in the outlet, a first filtering device and a second filtering device are arranged on the filtering pipe, and a third filtering device is arranged on the outer side of a gas outlet end of the filtering pipe. The waste gas purifier is simple in structure and reasonable in design, harmful substances with different chemical properties in the waste gas can be filtered by steps through the first filtering device, the second filtering device and the third filtering device, and the filtering is thorough.