Method for cleansing and deodorizing air in livestock and poultry house in multistage manner

The invention relates to a method for cleansing and deodorizing air in a livestock and poultry house in a multistage manner. The method uses a system for cleansing and deodorizing air in the livestockand poultry house in the multistage manner. The system is arranged on the upper portion of the livestock and poultry house and comprises a waste gas collecting chamber (3), a primary cleansing chamber (7) and a secondary cleansing chamber (12) and is characterized in that the waste gas collecting chamber (3) is the bottommost layer of the system and comprises a space formed by a bottom chemical adding water tank (4), an upper chemical adding water curtain (10) and walls on four sides, the bottom of the primary cleansing chamber (7) is the upper chemical adding water curtain (10), the upper portion of the primary cleansing chamber (7) is a microbial curtain (11), and the primary cleansing chamber (7) is sealed by peripheral walls; the bottom of the secondary cleansing chamber (12) is the microbial curtain (11), th