The utility model relates to a device for blowing ultra-fine metal silicon powder into a bag. The device comprises a gas storage tank, an oil-water separator, an adjustable sprayer, a conveying pipe, a holder, a carbon rod, a silicon water bag, a storage cabin, a pressure control valve, a gas source control valve and the like, wherein the gas storage stank, the oil-water separator, the adjustable sprayer, the carbon rod and the silicon water bag are connected and communicated through the conveying pipe. Compressed air is taken as conveying power, and ultra-fine metal silicon powder is sprayed into a silicon bag under the action of the adjustable sprayer and is directly sprayed into a high-temperature silicon liquid for undergoing secondary smelting and recycling, so that the product recovery rate is increased, the production cost is lowered, and the problems that the ultra-fine metal silicon powder suspends easily and is difficult to recycle are solved.