The invention relates to a buffering device for gravel blanking. The buffering device comprises a blanking hopper and a buffering device body arranged in the blanking hopper, and an anti-overflowing apron board is arranged on the periphery of the lower end of the blanking hopper; and the buffering device body comprises a plurality of triangular buffering boards arranged side by side, each buffering board comprises three rotating boards, a center shaft and restoration torsion springs, the side edges of the corresponding three rotating boards are rotatably connected with the corresponding center shaft and evenly distributed on the external circumference of the corresponding center shaft, and the restoration torsion springs are arranged between every two adjacent rotating boards. The buffering device for gravel blanking has a buffering effect on blanking, a transverse board and the vertical rotating boards are matched to form the grid-shaped buffering device body, gravel can be dispersed, finally the buffering device is restored again after buffering is completed, and the buffering device further can have an isolating effect.