The invention discloses a high-efficient grinding device, which comprises a cart pushing seat and a grinding machine body fixedly arranged above the cart pushing seat. A first cavity, a second cavityand a third cavity communicating with one another are sequentially arranged in the grinding machine body from right to left; a hydraulic pump is arranged on the top part of the cart pushing seat; thelower side of the hydraulic pump is hydraulically connected with a downwards extended hydraulic telescopic column; a cantilever support body symmetrical left and right is arranged in the first cavity;a feeding hole is formed in the top part of the cantilever support body; two elastic grinding mechanisms are symmetrically arranged on lower ends of two sides of the cantilever support body; a grinding plate is arranged on the bottom part of the first cavity in a rotatable and matched connection way; an air ring is fixedly arranged on an outer surface of the circumference of the grinding plate; acircle of baffle ring is arranged on an edge of the grinding plate; the top part of the grinding plate is provided with an inclined part; and the lower side of the grinding plate is fixedly connectedwith a first rotary shaft. The high-efficient grinding device provided by the invention is simple in structure, convenient to operate, and convenient to move and carry, and meanwhile, the grinding efficiency and a grinding effect are improved.