Waterborne epoxy emulsion, high-film-thickness epoxy primer and preparation method of high-film-thickness epoxy primer

The invention relates to a waterborne epoxy emulsion, a high-film-thickness epoxy primer and a preparation method of the high-film-thickness epoxy primer, and belongs to the technical field of waterborne coating processing, the waterborne epoxy emulsion comprises the following components in parts by weight: 1-2 parts of an epoxy component A, 43-50 parts of epoxy resin B, 6-8 parts of a cosolvent B, 4-6 parts of an emulsifier, 0.1-0.2 part of a dispersant, 35-40 parts of water and 0.2-0.3 part of epoxy resin C; a high-film-thickness epoxy primer is composed of a component A and a component B. The component A is prepared from, by weight, 35-45 parts of waterborne epoxy emulsion, 1-2 parts of propylene glycol monomethyl ether, 0.1-0.2 part of a defoaming agent, 0.4-0.5 part of a dispersing agent, 0.1-0.2 part of a wetting leveling agent, 0.5-1 part of a flash rust inhibitor, 0.1-0.2 part of montmorillonite clay, 0.3-0.5 part of dipropylene glycol butyl ether, 5-8 parts of anti-rust pigment and 3-5 parts of titan