Rotary-type back-flushing liquid absorption filter

The utility model discloses a rotary-type back-flushing liquid absorption filter. The rotary-type back-flushing liquid absorption filter comprises a shell, a filter element and a cut-off valve, wherein a through cavity is formed in the shell; a liquid absorption opening is formed in one end of the through cavity; a liquid outlet is formed in the other end of the through cavity; the filter element is rotatably arranged in the through cavity and separates the through cavity from the liquid outlet; the liquid absorption opening is communicated with the through cavity; an outlet of the filter element is communicated with the liquid outlet; the cut-off valve is arranged at the liquid absorption opening and controls a liquid box to supply a liquid to the liquid absorption opening; a plurality of back-flushing liquid injection holes which are distributed along the length direction of the filter element and are communicated with the through cavity are formed in the side wall of the shell; and a back-flushing liquid o