Processing method of barium sulfate composite coating for reducing thermal expansion degree of aircraft shell

The invention relates to the technical field of aircraft shell coatings, and discloses a barium sulfate composite coating for reducing the thermal expansion degree of an aircraft shell. The barium sulfate composite coating comprises the following raw materials in percentage by weight: 10-40% of precipitated barium sulfate, 10-20% of rutile titanium dioxide, 35-55% of water-soluble functional resin, 5-10% of water, 0-5% of a pigment, 0-3% of a coating additive, 3-10% of a cross-linking agent, 10-17% of edible alcohol, 12-16% of polypropylene fibers, 10-14% of expansive diatomite and 16-20% of asbestos fibers. According to the processing method of the barium sulfate composite coating for reducing the thermal expansion degree of the aircraft shell, the aircraft shell is coated with the barium sulfate composite coating, so that the temperature of the aircraft shell can be greatly reduced, temperature transfer generated by temperature difference inside and outside an aircraft is ensured, and corresponding heat ins