Vibration platform for screening building materials

The vibration platform for screening the building materials comprises a damping base, a fixed screening frame is arranged above the damping base, and a blanking through hole is formed in the center of the upper surface of the fixed screening frame in a penetrating mode. Two symmetrically-arranged elastic adjusting cavities are formed in the positions, located on the two sides of the discharging through hole, of the upper surface of the fixed screening frame, elastic blocking devices are arranged at the positions of the elastic adjusting cavities, and the elastic blocking devices conveniently control limiting or avoiding of the fixed limiting blocks. Two symmetrically-arranged limiting sliding ways are fixedly connected to the positions, located on the two sides of the discharging through hole, of the upper surface of the fixed screening frame, a material screening frame is arranged between the two limiting sliding ways, supporting sliding devices are arranged at the positions, close to the two sides of the li