Corrosion-inhibition rust-proof composite coating as well as preparation method and application thereof

The invention relates to the technical field of metal surface corrosion inhibition and rust prevention, and discloses a corrosion inhibition and rust prevention composite coating agent which comprises the following raw materials in percentage by mass: 20-60% of hydrocarbon wax mainly containing n-alkanes, 10-30% of metallocene poly-alpha olefin and 5-20% of drying oil or derivative resin of the drying oil. The content of the n-alkanes in the hydrocarbon wax mainly containing the n-alkanes is not lower than 80 wt%, and preferably, the hydrocarbon wax mainly containing the n-alkanes is Fischer-Tropsch wax. The composite coating agent has the beneficial effects that the composite coating agent can form a wax-based composite anti-rust coating on the metal surface, has more excellent water resistance, salt mist resistance, heat and humidity resistance and low-temperature flexibility, and particularly can delay the spreading of the rusted part on the metal surface, so that the effect of delaying the corrosion diffu