The invention discloses equipment for processing odor and organic pollutant by biological filtration, which is mainly used for the fields of chemical environmental protection treatment, environment pollution and purification treatment, and the like. The equipment comprises a spraying through tower and a biological filter, wherein the biological filter comprises a buffer layer, a biological bacteria filter layer and an exhaust layer; biological fillers are filled in the biological bacteria filter layer; the spraying through tower filters exhaust gas through spraying water and then transmits into the buffer layer of the biological filter layer; the buffer layer buffers the exhaust gas and then transmits into the biological bacteria filter layer in a voltage-sharing way; the exhaust gas and the biological filters react fully and then the exhaust gas enters the exhaust layer to be exhausted. Due to the adoption of the combination of the spraying through tower and the biological filter, the cleaning and filtering treatment effects of the equipment to the exhaust gas are significant; meanwhile, due to the adoption of the biological bacteria decomposition technique, the pollutant factors in the exhaust gas can be decomposed completely, the pollution degree of the odor to the air is reduced; furthermore, the whole equipment is simple in structure and convenient to operate, therefore the equipment has preferable market prospect.