River water intake retaining device

The utility model belongs to the technical field of river purification, and relates to a river water intake retaining device which comprises two mounting seats symmetrically arranged on the inner wall of a water intake of a dam body, mounting cavities are formed in the two mounting seats, sealing covers are arranged on the opposite sides of the two mounting seats, four supporting rollers are rotationally arranged between the two sealing covers, and the supporting rollers are arranged on the mounting seats. A filter screen is arranged on the four supporting rollers, the upstream face and the downstream face of the filter screen are each of an inclined structure, a plurality of material stirring pieces are evenly arranged on the outer side of the filter screen, a driving roller is arranged among the four supporting rollers, blades are arranged on the driving roller in a circumferential array mode, the driving roller is in transmission connection with the four supporting rollers, and a collecting box is arranged