NOVELTY - A methanol gasoline composite additive contains 12-35 vol.% latent solvent, 11-28 vol.% combustion improver, 7-14 vol.% anti-knock agent, 6-14 vol.% steam pressure regulator, 7-16 vol.% mutual solvent, 5-14 vol.% metal corrosion inhibitor, 2-10 vol.% antioxidant, and 6-12 vol.% rubber swelling inhibitor with respect to total raw material composition of 100 vol.%. Latent solvent consists of 16-28 vol.% butanediol, 8-20 vol.% hexanediol, 26-38 vol.% straight-chain 8-carbon octyl polyoxyethylene ether, and 10-28 vol.% ethyl acetate with respect to 100 vol.% total latent solvent raw materials.    USE - A methanol-gasoline composite additive for M25-M60 methanol gasoline preparation (claimed).    ADVANTAGE - The composite additive has enhanced stability. The methanol-gasoline latent solvent organic phase solution is not layered, has no emulsification, and can enhance corrosion resistance and environment adaptability of the composite additive.    DETAILED DESCRIPTION - A methanol gasoline composite additive contains 12-35 vol.% latent solvent, 11-28 vol.% combustion improver, 7-14 vol.% anti-knock agent, 6-14 vol.% steam pressure regulator, 7-16 vol.% mutual solvent, 5-14 vol.% metal corrosion inhibitor, 2-10 vol.% antioxidant, and 6-12 vol.% rubber swelling inhibitor with respect to total raw material composition of 100 vol.%. Latent solvent consists of 16-28 vol.% butanediol, 8-20 vol.% hexanediol, 26-38 vol.% straight-chain 8-carbon octyl polyoxyethylene ether, and 10-28 vol.% ethyl acetate with respect to 100 vol.% total latent solvent raw materials. Combustion improver consists of 36-58 vol.% isoprene, 21-32 vol.% ethylbenzene, 18-26 vol.% cumene, 4-8 vol.% trinitrotoluene, 2-4 vol.% nitroethane, and 2-6 vol.% nitrobenzene with respect to 100 vol.% total combustion improver raw materials. Anti-knock agent consists of 56-85 vol.% ethyl tert.-butyl ether and 18-44 vol.% dimethyl with respect to 100 vol.% total anti-knock agent raw materials. Steam pressure regulator consists of 36-42 vol.% ethyl acetate, 4-52 vol.% methoxy N-acetaldehyde dimethyl ethanol, and 10-22 vol.% dimethoxymethane with respect to 100 vol.% total steam pressure regulator raw materials. Mutual solvent consists of 6-20 vol.% n-propanol, 5-12 vol.% isopropanol, 6-21 vol.% n-butanol, 5-23 vol.% isobutanol, 12-32 vol.% n-octanol, and 12-19 vol.% isooctanol with respect to 100 vol.% total mutual solvent raw materials. Metal corrosion inhibitor consists of 6-18 vol.% pyrazolone, 8-22 vol.% alkenyl succinic acid, 6-17 vol.% benzotriazole, 7-19 vol.% lysine, and 38-56 vol.% dimethylbenzene with respect to 100 vol.% total metal corrosion inhibitor raw materials. Antioxidant consists of 36-47 vol.% tetraethylenepentamine, 20-72 vol.% N,N'-di-sec.-butyl p-phenylenediamine, and 28-80 vol.% 2,4-dimethyl-6-tert.-butylphenol with respect to 100 vol.% antioxidant raw materials. Rubber swelling inhibitor consists of 31-45 vol.% dibutyl sebacate, 27-35 vol.% dioctyl phthalate, and 25-34 vol.% 2-methyl benzothiazole with respect to 100 vol.% rubber swelling inhibitor raw materials.