Sludge deposition prevention device for pit

The utility model discloses a sludge deposition prevention device for a pit. The sludge deposition prevention device comprises a compressed air pipeline, and is characterized in that a valve, a time delay switch and a pressure reduction valve are arranged on the compressed air pipeline in sequence; a plurality of vertical pipelines are arranged on the pipeline led into the pit; two rows of horizontal pipelines are arranged at the bottom of the pit; the horizontal pipelines and the vertical pipelines are perpendicularly intersected; downward nozzles are uniformly arranged on the first horizontal pipeline close to the bottom of the pit; upward nozzles are uniformly arranged on the second horizontal pipeline positioned on the upper side; the third horizontal pipeline is arranged at a position close to an outlet of the pit; downward nozzles are uniformly arranged on the third horizontal pipeline. Due to the arrangement of the multiple rows of the nozzles, large-area sweeping is realized at the bottom of the pit; high-pressure air is used as a power medium, and the facing directions of the nozzles are configured, so that sludge at the bottom of the pit can be suspended, and waste liquid can be prevented from being blown out of the pit; the device can be reasonably and effectively used.