Inclined plate horizontal sedimentation tank for backwash desilting

The invention discloses an inclined plate horizontal sedimentation tank for backwash desilting. The inclined plate horizontal sedimentation tank comprises a water inlet area, a water outlet area, a sedimentation area located between the water inlet area and the water outlet area and an inclined plate installed in the sedimentation area, wherein a water inlet channel communicated with the sedimentation area is arranged at the bottom of the water inlet area; an overflow port communicating the sedimentation area with the water outlet are is formed between the sedimentation area and the water outlet area; a filter head, an air supply pipeline connected with the filter head and used for conveying high-pressure air to the filter head and a water supply pipeline used for conveying high-pressure water flow to the filter head are arranged at the bottom of the sedimentation area; and the inclined plate is positioned above the filter head, and a plurality of through holes are formed in the inclined plate. The inclined p