Air purification device with filter screen convenient to replace

The invention discloses an air purification device with a filter screen convenient to replace, which comprises a shell, an air inlet, an air outlet and a filter screen, a mounting hole is formed in the top wall of the shell; the inner wall of the shell is provided with a guide groove arranged along the vertical direction, and the guide groove is communicated with the mounting hole; the filter screen can be arranged in the shell in a removable manner through the mounting hole, and after the filter screen is arranged in the shell, the filter screen is matched with the guide groove; the filter screen is arranged in the shell, the cover plate is connected with the filter screen, and after the filter screen is arranged in the shell, the cover plate seals the mounting hole; and the connecting piece is connected with the cover plate. During working, the exhaust fan works. Air enters from the air inlet, is filtered by the filter screen and is discharged from the air outlet. After the filter screen is used for a perio