Negative pressure fan tail end multi-stage deodorization system and method

The invention provides a negative pressure fan tail end multi-stage deodorization system and method, and relates to the field of waste gas treatment of livestock and poultry farms. The negative pressure fan tail end multi-stage deodorization system comprises a negative pressure fan set and an odor collection pressure chamber, an odor purification unit is arranged on the rear side of the odor collection pressure chamber, a main control chamber is arranged on one side of the odor purification unit, the odor purification unit comprises three sets of plastic blocking nets and a liquid storage pool arranged at the bottom ends of the three sets of plastic blocking nets, and the main control chamber is connected with the negative pressure fan set. Spraying pipelines are arranged at the upper end and the front side of the plastic blocking net, the liquid storage pool comprises a water washing liquid storage pool, an acid pickling liquid storage pool and a microbial agent liquid storage pool which are sequentially arr