Activated carbon waste gas purifier

The utility model discloses an activated carbon waste gas purifier which comprises a filter box pipe, a buckle shifting plate is installed on the front face of the filter box pipe in a sliding mode, an installation frame is detachably installed in the filter box pipe, a pull ring is fixedly installed on the front face of the installation frame, a positioning sliding block is fixedly installed at the bottom end of the installation frame, and a cover is detachably installed on the front face of the positioning sliding block. A spring is fixedly connected to the inner wall of the mounting frame, a U-shaped plate is fixedly connected to one end of the spring, and an activated carbon plate is detachably mounted in the U-shaped plate. By utilizing the early warning device, the distance can be changed by changing the self weight of the activated carbon plate after the activated carbon plate absorbs the activated carbon plate to a certain degree, so that the aim of identifying that the activated carbon plate needs to