The utility model discloses a coarse iron removing device before feeding of a superfine grinder, and is characterized by comprising a shell (1), a motor (5), a transmission mechanism and a grinding device (4), wherein the transmission mechanism consists of a belt (7) and a spindle (3); the grinding device (4) is arranged on the spindle (3); a feeding port (2) is arranged above the shell (1); a sundry cleaning port (6) is arranged below the grinding device (4); a discharging port (9) is arranged below the shell (1); and a filtering orifice plate (8) is arranged in the front of the discharging port (9). The coarse iron removing device exchanges block-shaped molecular sieve material particles into fine powders, and simultaneously retains ironware of screws, screw caps and the like entrained in materials, thus guaranteeing the smoothness and evenness of the feeding of the superfine grinder.