The invention relates to a plasma device for manufacturing a metal powder. The plasma device comprises a reaction vessel; a generating container; a plasma gun for generating plasma between metal raw materials in the reaction vessel to evaporate the metal raw materials and furthermore generate metal vapor; a carrier gas supply part for supplying a carrier gas for carrying the metal vapor towards the reaction vessel; and a cooling tube for cooling the metal vapor conveyed from the reaction vessel by the carrier gas to generate the metal powder. The cooling tube comprises an indirect cooling area for cooling the metal vapor and/or metal powder without directly contacting a cooling fluid with the metal vapor and/or metal powder; and a direct cooling area for cooling the metal vapor and/or metal powder by contacting the cooling fluid with the metal vapor and/or metal powder. The cooling tube inclines by 10-80 DEG C relative to the horizontal direction in the reaction container in the way of making the downstream side of the cooling tube above along the length direction, and a scraper for removing attachment substances attached on the inner wall of the cooling tube is embedded into the cooling tube from the downstream side of the cooling tube along the length direction.