Defecating and filtering device of lime processing system

The utility model provides a defecating and filtering device of a lime processing system. The technical scheme is as follows: the device comprises a defecating pond, a sand filter, a clean water pond and a fast reactor. A medicine adding inlet, a water inlet and a water outlet are arranged at the fast reactor; the water inlet is connected with the water outlet pipeline of the defecating pond and the water outlet extends into the sand filter by a pipeline. The device has the advantage of good leakproofness, potential of hydrogen (pH) of outgoing water is easy to control, water distribution is even, occupied area is small, investment cost is low, and the like. The safety and the stable operation of water processing systems are ensured.