Sewage filtering and deslagging device

The utility model relates to a sewage filtering and deslagging device. The device comprises a first-stage shell and a second-stage shell arranged on the periphery of the first-stage shell in a sleeving mode, the lower end of the second-stage shell is connected with the lower portion of the first-stage shell, a cylinder coaxial with the first-stage shell is arranged on the second-stage shell, the upper portion of the cylinder is connected with the upper end of the second-stage shell, and the lower portion of the cylinder penetrates through the lower end of the first-stage shell; the lower partof the primary shell is provided with a water inlet, and the lower part of the secondary shell is provided with a drain outlet; the cylinder is coaxially sleeved with a spiral blade arranged in the first-stage shell and a first gear arranged above the spiral blade, the spiral blade is coaxially connected with the first gear, the second-stage shell is provided with a second gear meshed with the first gear, and the second-s