The invention belongs to the technical field of fluid pressure executing equipment, and particularly relates to a screw cup. The screw cup comprises an inner cup body with a round end surface, whereinan outer cup body with a round end surface is arranged on the periphery of the inner cup body in a sleeving mode, a plurality of spiral blades are arranged between the inner cup body and the outer cup body, each spiral blade extends along the height direction of the inner cup body, the number of the spiral blades is not smaller than 4, the plurality of spiral blades are uniformly distributed along the end surface of the screw cup, the inner edges and the outer edges of the spiral blades are fixedly connected with the inner cup body and the outer cup body correspondingly, the height of the inner cup body is larger than that of the outer cup body, and spiral angles of the spiral blades are larger than 2 degrees. The screw cup is reasonable in structure and capable of effectively avoiding the backflow problem in the fluid pressurizing and conveying process.