Fertigation facility of domestic sewage after biochemical treatment

The invention relates to a fertigation facility of domestic sewage after biochemical treatment, which consists of a water storage system and a fertigation system. The water storage system comprises a water storage pool, a sand filtering pool and a water collecting pool which are connected in series; a water distributor is arranged in the sand filtering pool; the tail end of the water storage pool corresponding to and parallel with the external water surface of the sand filtering pool is provide with a water collecting pipe, and the water collecting pipe is connected with a guide pipe arranged in the sand filtering pool; an overflow weir is arranged at the top of a wall body separating the sand filtering pool from the water collecting pool; and a sand outlet is arranged at the bottom at the other side in the water storage pool. A submerged pump which is connected with a main fertigation tape is arranged at the bottom in the water collecting pool in the water storage system; one path of the main fertigation tape is connected with a filter through a water feed valve, and the other path of the fertigation tape is connected with a fertilizer applicator through a fertilizer feed valve; the fertilizer applicator is respectively connected with a fertilizer tank and the filter; and the filter is connected with a fertigation branch pipe through a pressure adjustment valve and a pressure meter. The invention effectively solves the important problems of storage, fertigation, fertilizer application and the like of treated domestic sewage and is completely suitable for irrigating the crops by using water discharged by all domestic sewage treatment plants.