Material blocking mechanism for auxiliary screening and screening device

The material blocking mechanism comprises a sieve and a material blocking assembly, the material blocking assembly comprises a seat plate, a movable plate and a plug pin, the seat plate is arranged in the middle of a sieve frame of the sieve in a crossing mode, and the two longitudinal ends of the seat plate extend in the vertical direction and are arranged above the sieve face of the sieve. The movable plate can be connected to the plate face of the seat plate in a sliding mode in the longitudinal direction, and the plug pin is arranged on the seat plate and can lock the movable plate. According to the utility model, the seat plate is arranged in the middle of the sieve with the inclined sieve surface, the bolt is arranged on the seat plate lock hole and can be clamped in the movable plate clamping hole to form a material blocking and flow regulating and controlling structure, and materials can be sieved and the blanking flow of the materials can be effectively controlled by adjusting the height of the movab