Air pollution monitoring device capable of sampling regularly for environmental protection engineering

The air pollution monitoring device comprises a mounting base, moving grooves are formed in the two sides of the top of the mounting base, threaded rods are movably connected to inner cavities of the moving grooves through bearings, and the surfaces of the threaded rods are in threaded connection with moving blocks; fixed blocks are fixedly connected to the front end and the rear end of the moving block, an air monitor body is arranged at the top of the mounting base, and mounting columns are fixedly connected to the front ends and the rear ends of the two sides of the air monitor body. Through cooperative use of the mounting base, the moving groove, the threaded rod, the moving block, the fixed block, the air monitor body, the mounting column, an exhaust pipe, an air inlet pipe, a fan, a connecting rod, an electromagnetic valve and a timer, the air monitor has a timed air maintenance function, is energy-saving and environment-friendly, can conveniently and quickly disassemble the air monitor body, and is con