The invention relates to the technical field of curing agents, in particular to an anti-after-tack epoxy curing agent and a preparation method and application thereof. The anti-after-tack epoxy curingagent is mainly prepared by, by weight, 35-40 parts of anacardol, 8-12 parts of formaldehyde, 13-17 parts of toluene, 3-7 parts of diethylenetriamine, 8-12 parts of triethylene tetramine and 15-25 parts of epoxy resin. The anti-after-tack epoxy curing agent and the preparation method thereof have the advantages that by introducing epoxy resin fragments into the epoxy curing agent, the molecular weight of the epoxy curing agent is further increased, and the epoxy curing agent is fast in drying and excellent in compatibility with the epoxy resin; the epoxy curing agent can have reaction fast under a low-temperature and high-humidity condition, phase separation is avoided due to the fact that the epoxy curing agent has good compatibility with the epoxy resin, the surface of a formed paint film is dry, a sticky oil surface is avoided, good ply adhesion after the recoating of the epoxy curing agent or the mixed-coating of the epoxy curing agent and other finish paint, and the dry paint film without the oil surface can be formed at 0 DEG C.