The invention discloses metal product polishing liquid. The polishing liquid is prepared from, by weight, 20-30 parts of citric acid, 50-100 parts of glacial acetic acid, 2-10 parts of 2-ethylimidazole, 5-12 parts of salicylic acid, 10-20 parts of glycolic acid, 8-15 parts of 1H-benzotriazole, 20-80 parts of polyethylene glycol 8000, 100-150 parts of tetrahydrofurfuryl alcohol, 50-150 parts of ethyl alcohol, 80-100 parts of butyl acetate, 5-12 parts of oleic alcohol polyoxyethylene ether, 5-12 parts of ethylenediamine, 4-6 parts of nano-silicon dioxide, 3-9 parts of nano-zinc oxide and 30-80 parts of auxiliaries. The metal product polishing liquid contains the auxiliaries, the auxiliaries contain rice bran and mango skin, an oxide layer on the surface of a metal product can be effectively removed by means of extraction, tea seed powder can remove blots on the surface of the metal product, effective substances in a polishing agent can easily make direct contact with the oxide layer on the surface of the metal product, the efficiency is improved when the polishing agent removes the oxide layer, and after being modified through iron powder, latex powder and natural resin can form a layer of compact protective film on the surface layer of the metal product after being polished.