The utility model relates to a grab anti-rotating mechanism of a rotating flow well material, belonging to the technical field of a hoisting machine. The mechanism comprises an anti-rotating arm lever (2), a grab (7), a C-typed guide rail (3) and a well wall of the rotating flow well (6); two sides of the grab are respectively arranged with one set of anti-rotating arm lever (2); the anti-rotating arm lever (2) and the grab (7) are connected by a high strength coupling bolt; and the well wall of the rotating flow well (6) is provided with a C-typed guide rail. The utility model has the advantages of improving the water quality of cooling water, effectively reducing the problems of blockage of cooling water pipelines and equipment and damages to the equipment, creating good conditions for guaranteeing normal operation of equipment and stable production of steel rolling.