The invention belongs to the technical field of mining equipment, and particularly relates to an ore lifting device for an open pit mine. The ore lifting device comprises two stand columns; a rotatingshaft is arranged between the two stand columns; a motor is mounted at one end of the rotating shaft; the motor is fixed on the stand column adjacent to the motor through a fixed seat; a steel wire rope is fixedly connected onto the rotating shaft; an ore box is connected with the bottom end of the steel wire rope; a limiting plate is connected onto the steel wire rope in an inserting manner; a conical seal cover is arranged at the top of the limiting plate; and the steel wire rope penetrates through the conical seal cover. The conical seal cover is arranged, under the limiting action of thelimiting plate, the conical seal cover drops on the steel wire rope and moves along with the movement of the steel wire rope to always shield the ore box, so that the condition that ore is soaked in rainwater is prevented, the overall weight is increased, and the safety in operation is improved.