Air purification device for chicken farm and use method of air purification device

The invention belongs to the technical field of chicken farm air treatment, and particularly relates to a chicken farm air purification device which comprises an external working box body and further comprises an air exhaust treatment mechanism, a dust fall control mechanism, a waste water backflow mechanism and an air exchange auxiliary mechanism, and the air exhaust treatment mechanism is arranged on the outer wall of the external working box body; the dust fall control mechanism, the waste water backflow mechanism and the ventilation auxiliary mechanism are all arranged in an inner cavity of the external working box body, the L-shaped pumping pipe is arranged on the outer wall of the external working box body, a first strip-shaped limiting plate is arranged on one side of the outer wall of the L-shaped pumping pipe, and a second strip-shaped limiting plate is arranged on the other side of the outer wall of the L-shaped pumping pipe; by improving the air quality of the chicken farm, the stress response of c