Compound concrete anti-corrosion and rust-resistant agent

The invention discloses a compound concrete anti-corrosion and rust-resistant agent which comprises the following components in parts by weight: 15-30 parts of a polycarboxylic acid water reducing agent, 3-12 parts of sodium dodecyl sulfate, 15.7-20.6 parts of N-dimethylethanolamine, 1-5 parts of sodium molybdate, and 50-60 parts of water. The compound concrete anti-corrosion and rust-resistant agent can block capillary holes in the concrete, improves the chloride ion permeability resistance of concrete, can significantly alleviate the damage of chloride ions on a reinforcing steel bar passivation film, enhances the sulfate corrosion resistant ability of the concrete, has excellent rust-resistant performance and good repair performance, can enhance durability of the concrete and the comprehensive anti-corrosion ability of the concrete, and significantly improves the durability of buildings.