Purification device for sponge city water storage system

The invention provides a purification device for a sponge city water storage system. The purification device comprises a box body, a barrel body, a plurality of material pushing plates and a material guiding assembly. An inlet is formed in the upper side of the box body, and a plurality of outer water outlets are formed in the lower side of the box body; cover bodies are connected to the two sides of the box body, and a plurality of discharging openings are formed in one cover body. The barrel is arranged in the through cavity and connected with the two cover bodies, and a feeding port with an upward opening and a plurality of inner water outlets with downward openings are formed in the barrel. The plurality of material pushing plates are arranged between the inner wall of the through cavity and the outer wall of the cylinder body and are arranged around the cylinder body; and the plurality of material pushing plates are connected through a synchronous transmission structure capable of driving the material pu