The invention provides an adhesive for connecting wood, particularly relates to a high-temperature-resistant wood adhesive and a preparation method thereof, and belongs to the technical field of adhesives. The high-temperature-resistant wood adhesive comprises the following components: plant starch, pentalyn, glycerol ester of hydrogenated rosin, barium sulfate, amine p-tolyl sulfinate, ammonium chloride, magnesium oxide, potassium peroxodisulfate, polyvinyl alcohol, butyl latex, resorcinol, microcrystalline wax, butyl methacrylate, triammonium citrate, calcium carbonate, phenol, 2-benzyl-4-chlorophenol, a formaldehyde aqueous solution, carbamide, melamine, sodium hydroxide, a surfactant, sodium hexadecyl benzene sulfonate and water. The bonding strength of the high-temperature-resistant wood adhesive can be higher than 2 MPa, and still be higher than 1.90 MPa after the high-temperature-resistant wood adhesive is soaked in water.