Sunken green belt irrigation device

The utility model relates to the technical field of sunken green belts, and discloses a sunken green belt irrigation device which comprises a green area, a collecting tank is fixedly arranged in the green area, a filter plate is fixedly mounted on the collecting tank, the filter plate is mainly used for filtering rainwater for the first time, a deposition tank is fixedly mounted on the collecting tank, and a spiral conveyor is fixedly mounted on the filter plate. A propeller is fixedly installed on the deposition tank and used for pushing impurities or silt at the bottom to the surface of a green belt to be discharged, an end cover is fixedly installed on the deposition tank, the spiral conveyor comprises a motor, a machine disc is fixedly installed on the motor, a conveying shaft blade is fixedly installed on the machine disc, and a button type telescopic pin is fixedly installed on the end cover. Filtered rainwater is discharged into the deposition tank in an accelerated mode through rotation of conveying b