The invention relates to a crushing device, in particular to an iron ore crushing device. The iron ore crushing device comprises a crushing box, wherein a water jacket is arranged on the outer side ofthe crushing box, a bulge is arranged on the inner wall of the crushing box, a feeding hopper is fixed at the top of the crushing box, an outlet of the feeding hopper is in butt joint with a feedingchute, the feeding chute is fixed on the inner surface of the upper plate of the crushing box, a baffle is arranged in an inner cavity of the feeding chute, two grinding crushing wheels are symmetrically arranged in the crushing box, an outlet of the feeding chute is located in the middle of the two grinding wheels, a stirring device is arranged below the grinding wheels, the stirring device is rotationally connected to a rotating shaft, the rotating shaft is fixed in a groove in the inner wall of the crushing box, crushing teeth are arranged below the stirring device, a discharging hopper isconnected to the bottom of the crushing box, and a vibrator is arranged on one side of the discharging hopper. According to the iron ore crushing device, the retention time of the iron ores in the crushing device is long, the crushing effect is good, blockage is avoided in the discharging process, the crushing device is cooled in the using process, the abrasion speed of the parts is reduced, and the service life is prolonged.