The invention relates to the field of detergent and provides metal detergent. The metal detergent aims at solving the problem that metal detergent is likely to affect breaking tenacity of metal. The metal detergent comprises, by mass part, 6-35 parts of polyvinyl alcohol, 5-35 parts of sodium laurylsulfate, 1-25 parts of silicon dioxide, 1-10 parts of sodium lauryl polyoxyethylene ether sulfate, 1-10 parts of coconutt diethanol amide, 1-6 parts of fatty alcohol-polyoxyethylene ether, 1-5 parts of cocoamidopropyl betaine, 0.1-5 parts of sodium citrate, 0.1-5 parts of polyether modified silicone, 0.1-5 parts of glycerinum, 0.1-3 parts of an anti-deposition agent, 0.05-2 parts of sodium acetate and the balance deionized water, wherein the number of the total mass parts of the metal detergentis 150. Anionic surfactant is matched with nonionic surfactant in the metal detergent, and tenderness of the metal detergent can be improved conveniently while detergency of the metal detergent is enhanced conveniently; the breaking tenacity of cleaned metal is not likely to be affected; and the service life of the metal can be prolonged conveniently.