The water containing mixed deodorant liquid medicine is automatically fed into the water tank through the automatic drug delivery equipment, and the water tank is full when the liquid medicine is stopped. The water pump and the fan start at the same time, and the water pump pumps the liquid medicine into the water pipe, and the water flows down through the deodorant curtain to form a water film;The fan starts to pump out the polluted air in the factory. After the first blue purification area, the harmful particles are precipitated, and then the air and the harmful particles are purified and precipitated through the water curtain water film in the second green area. The water vapor then evaporates upwards, and the water drops are collected and fall through the defogging system, and then the purified air is discharged.