The invention discloses a low-viscosity anticorrosive metal antirust agent. The low-viscosity anticorrosive metal antirust agent comprises sodium gluconate, dimethyl fumarate, dibutyltin dilaurate, sodium hexametaphosphate, sodium dodecyl sulfate, water-soluble silicone oil, triethanolamine, sodium molybdate, an organic phosphonic acid, sodium benzoate, carboxylic acid amine, boric acid amine, diglycolamine, maleic anhydride, m-phthalic acid anhydride, zinc acetate, terephthalic acid, itaconic acid, cobaltous naphthenate, sodium tungstate, anhydrous sodium carbonate, nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate calcium sulfonate, dodecylbenzene sulfonic acid, a modifying lubricant, a modifying anticorrosion auxiliary agent, a modifying curing agent, an adhesive promoter, and water. The low-viscosity anticorrosive metal antirust agent is low in viscosity, and excellent in anticorrosive and antirust capacity.