Return air purification device

The utility model relates to a return air purification device, which belongs to the technical field of air filtration and comprises a frame, an air filter movably connected with the frame is arrangedon the frame, a riveted panel is arranged on one side of the frame, a shutter detachably connected with the panel is arranged on the panel, and the air filter is a flat plate type filter. The panel and the frame are riveted through the rivets, the operation is convenient, the space for additionally arranging the air filter is realized, and the air supply amount is not reduced while PM2.5 is efficiently removed through the additionally arranged high-efficiency low-resistance flat plate type filter; the air filter can be conveniently and rapidly fixed and disassembled through the integrally formed spring buckles, the working efficiency is improved, no space is occupied, and the practicability is high; the detachably connected shutter is mounted at the air inlet, so that the air filter is convenient to replace, and t