The invention relates to an ore dressing feed box. The ore dressing feed box comprises a material box, a buffering plate, a sieve net, an impurity removing gate and a discharging pipe, wherein the buffering plate is obliquely arranged in the middle in the material box, and the buffering plate is located below a discharging opening of an ore pulp pipeline; the sieve net is horizontally arranged inthe middle in the material box, and the sieve net is connected with the buffering plate; the impurity removing gate is arranged on the side wall of the material box at the side far from the bufferingplate of the sieve net; the discharging pipe is arranged below the impurity removing gate, and the discharging pipe communicates with the inner bottom of the material box; and the upper end of the sieve net is provided with a blade made from iron. Compared with the prior art, the ore dressing feed box can pulverize large particles of ores in ore pulp, prevent the sieve net from being blocked and is high in impurity removing efficiency.