NOVELTY - A magnesium silicide is produced by (A) adding silicon powder into silicon powder loading hopper (2a); (B) adding magnesium powder into magnesium powder loading hopper (2b); (C) mixing silicon powder with magnesium powder; and (D) cooling and discharging. The silicon powder loading hopper is vacuumized, and then vacuumized again after at least one nitrogen is blown. Silicon powder is delivered to a stirring reactor (1) by a spiral feeder (5a), where insulating temperature of stirring reactor is 500-650 degrees C. Magnesium powder loading hopper is added with 1.6-1.8 times magnesium powder.    USE - Method for production of magnesium silicide (claimed) used in semiconductor material, micro-electronics, solar battery and ceramics.    ADVANTAGE - The method has reduced energy consumption.    DETAILED DESCRIPTION - Magnesium silicide is produced by (A) adding silicon powder into silicon powder loading hopper (2a); (B) adding magnesium powder into magnesium powder loading hopper (2b); (C) mixing silicon powder with magnesium powder; and (D) cooling and discharging. The silicon powder loading hopper is vacuumized, and then vacuumized again after at least one nitrogen is blown. Silicon powder is delivered to a stirring reactor (1) by a spiral feeder (5a), where insulating temperature of stirring reactor is 500-650 degrees C. Magnesium powder loading hopper is added with 1.6-1.8 times magnesium powder. Magnesium powder loading hopper is vacuumized, and then vacuumized again after at least one nitrogen is blown. The magnesium powder is delivered to the stirring reactor (1) by a spiral feeder. The step (C) comprises vacuumizing stirring reactor again after at least one nitrogen is blown, where stirring speed is 2-40 revolutions/minute, where mixed reaction time is 10 minutes to 4 hours. Discharging hopper is vacuumized again after at least one nitrogen is blown. Magnesium silicide powder is arranged in discharging hopper. The discharging hopper is cooled by water jacket. Cooling time is 10 minutes to 5 hours. Temperature of cooled magnesium silicide powder is 10-70 degrees C. Magnesium silicide powder is collected by the discharging hopper. An INDEPENDENT CLAIM is included for magnesium silicide production device which comprises stirring reactor, where upper part of stirring reactor is connected with two sets of feeding mechanisms. Lower part of the stirring reactor is connected with cooling discharging mechanism. Stirring reactor, feeding mechanism and cooling discharging mechanism are communicated with gas protecting mechanism. Feeding mechanism comprises feeding hopper, hand hole, feeding powder valve, spiral feeder, speed regulating motor and feeding port. Upper part of the feeding hopper is provided with hand hole. Bottom part of feeding hopper is provided with feeding powder valve. The bottom end of feeding powder valve is connected with spiral feeder. Spiral feeder is communicated with the upper part of the stirring reactor by feeding port. Spiral feeder is driven by speed regulating motor. Stirring reactor comprises body, speed reducer, stirring shaft, stirring blade, heating sleeve, insulating sleeve and stirring powder valve. The body is inserted with stirring shaft, where upper part of the stirring shaft is sleeved with a stirring blade. Outer end of the stirring shaft is provided with speed reducer. Middle side wall of body is covered with heating sleeve. Lower side wall of body is covered with insulating sleeve. Bottom part of body is connected with stirring powder valve. Stirring powder valve is communicated with cooling discharging mechanism. Cooling discharging mechanism comprises discharging hopper, water jacket and discharging powder valve. Outer side wall of the discharging hopper is sleeved with water jacket. Bottom part of discharging hopper is connected with discharging powder valve. Gas protecting mechanism comprises mechanical vacuum pump, argon bottle, nitrogen bottle, hydrogen bottle, pipeline and controller. Mechanical vacuum pump, argon bottle, nitrogen bottle and hydrogen bottle are respectively communicated with pipeline and controlled by gas valves. Pipeline is respectively communicated with body, feeding hopper and discharging hopper and controlled by controller.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating a method for producing magnesium silicide.