Self-cleaning sewage elevator

The utility model discloses a self-cleaning type sewage elevator which comprises a sewage tank, a water inlet pipe, at least two drainage pipes, a backwashing pipe and a sewage lifting pump, the drainage pipes are communicated with the water inlet pipe through connecting pipes, the end of each drainage pipe is communicated with a collecting pipe, the backwashing pipe and the drainage pipes are correspondingly arranged, one end of the backwashing pipe extends into the sewage tank, and the other end of the backwashing pipe extends into the sewage tank. A sewage lifting pump located in the sewage tank is arranged at the end of the backwashing pipe, a residue filter located outside the sewage tank is detachably connected between the backwashing pipe and the drainage pipe, and the residue filter comprises a shell with the two ends in sealed connection with the backwashing pipe and the drainage pipe respectively. A first filter screen and a second filter screen are sequentially arranged in the shell from the positi