The invention discloses an aluminum-matrix aquo-system metal micropowder coating and a process therefor and relates to the technical field of machinery. The aluminum-matrix aquo-system metal micropowder coating is characterized by being prepared from the following raw materials in parts by weight: 20-25 parts of hydrochloric acid, 15-20 parts of tartaric acid, 5-10 parts of HS-99, 5-10 parts of dodecyl sulfuric acid and 10-20 parts of additives. The process for the aluminum-matrix aquo-system metal micropowder coating comprises the steps of pretreatment, coating solution preparing, coating, flushing, preheating, baking, cooling and the like. The aluminum-matrix aquo-system metal micropowder coating prepared by the process has the advantages of uniform and smooth appearance, relatively highornamental performance and relatively good corrosion resistance and heat resistance; and the coating process is simple and convenient, so that the labor cost is reduced.