The invention discloses a flour mill which is composed of a rack, an automatic feeding machine, a particle material barrel, a vibration feeder, a feeding pipe, a mill body, a draught fan, a suction pipe, a cyclone separator, a combined airlock, a rotating frame, a balance weight, a separation sieve and a soft connector. According to the mill body, an upper cover and a main shaft shell are fixed to the upper side and the lower side of an abrasive disk shell respectively, a main shaft is arranged in the main shaft shell through a bearing, a lower cutterhead is arranged on a movable dish, a gap is reserved between the lower cutterhead and the movable dish, the movable dish is fixed to the main shaft, an upper cutterhead is fixed to a fixing base, and a gap is reserved between the upper cutterhead and the fixing base. The abrasive disk shell is internally provided with an upper air duct, a middle air duct and a lower air duct for cooling the outer side of the upper cutterhead, the position between the upper cutterhead and the lower cutterhead and the outer side of the lower cutterhead respectively. An air outlet is communicated with the draught fan. The fixing base is connected with the upper cover. A feeding opening is communicated with the fixing base. The flour mill has the advantages that air cooling is conducted on the upper cutterhead and the lower cutterhead, rotation is stable, working efficiency is high, and the unbalanced loading can be matched automatically.