The invention belongs to the technical field of concrete member protective materials and particularly relates to a salt-frost-resistant and rust-resistant coating for a concrete member. According to the coating, by weight, 10-25 parts of liquid silane, 4-8 parts of triisobutylsilane, or octyl silane or isooctyl silane, 1-2 parts of a chelating agent, 1-2 parts of triethanolamine, 0.2-0.6 parts of polyoxyethylene ethers nonionic surfactant and 0.3-2 parts of boric acid are mixed to be uniform and prepared into a coating stock solution; the coating stock solution and solvent are diluted according to the weight ratio of 1: (1-10) and then used. The salt-frost-resistant and rust-resistant coating for the concrete member has a permeation function, is excellent in hydrophobic permeability performance and has a reinforcing steel bar rust resistance function and capacity of improving salt frost resistance of the concrete member.