Impurity removal sieve for ore discharge of ore grinding machine

The utility model discloses an impurity removal sieve for ore discharge of an ore grinding machine. The device comprises an ore grinding machine and an impurity removing screen body which are fixedlyconnected, wherein the impurity removal screen body comprises a screen drum and a plurality of circles of first spiral blades, the screen drum is cylindrical and comprises a screening part and an impurity removal part which are sequentially arranged left and right, a plurality of short kidney-shaped screen holes are uniformly distributed in the drum wall of the screening part, and an impurity removal spiral conveying device is arranged in the screen drum; the spiral conveying device comprises a plurality of circles of second spiral blades, and the first spiral blades and the second spiral blades are fixedly connected to the inner wall of the screen drum in an equal-period mode. Impurities in ore discharged by the ore grinding machine are separated, the problems of clamping stagnation and pipeline blockage caused b