NOVELTY - A bio-based methanol gasoline oil stabilizer, comprises following functional components: acid components containing: 7-10 vol.% yeast extract and/or 6-10 vol.% fatty alcohol; balancing acid-base components containing: 6-10 vol.% fatty alcohol and 7.5 vol.% fatty acids; viscosity improving components containing: 30 vol.% fatty acid ester; distillation modifying component: 20 vol.% fatty alcohol; and stable liquid phase component: 16.5-19.5 vol.% fatty alcohol, where the yeast extract is fatty acid soap, which is 16-18C petroleum yeast fatty acid and triethanolamine in volume ratio of 2:1.    USE - As bio-based methanol gasoline oil stabilizer (claimed).    ADVANTAGE - Compared with the existing technology, the method has obvious stable effects; can not bring secondary pollution to the environment. The oleyl alcohol having water content more than 10% are still stationary phase as long as 180 days, and after breaking the methyl alcohol content is more than 85%. The bio-based methanol gasoline oil stabilizer has good water resistance, low uniformity, acid-alkali balance, and long time storage of oleyl alcohol and a commercial gasoline mixed according to any proportion without generating emulsion and phase separation; has more complete burning; and has reduced formaldehyde, formic acid and tail gas pollution discharge.    DETAILED DESCRIPTION - A bio-based methanol gasoline oil stabilizer, comprises following functional components: acid components containing: 7-10 vol.% yeast extract and/or 6-10 vol.% fatty alcohol; balancing acid-base components containing: 6-10 vol.% fatty alcohol and 7.5 vol.% fatty acids; viscosity improving components containing: 30 vol.% fatty acid ester; distillation modifying component: 20 vol.% fatty alcohol; and stable liquid phase component: 16.5-19.5 vol.% fatty alcohol, where the yeast extract is fatty acid soap, the fatty acid soap is 16-18C petroleum yeast fatty acid and triethanolamine according to volume ratio of 2:1 formed by saponification at normal temperature; the fatty acid amine is ethanolamine and/or diethanol amine; the 16-18C petroleum yeast fatty acid from the yeast strain petroleum oils and petroleum yielding conventional EAM-AC16 yeast fermented extract having preservation number of (CGMCC N0.7429). An INDEPENDENT CLAIM is included for preparation of the bio-based methanol gasoline oil stabilizer, involving: connecting the acid component, balancing acid-base component, the viscosity modifying component and distillation modifying component with stable liquid phase component added to the stirring kettle, stirring them uniformly to obtain transparent, clear display colorless or light yellow bio-based methanol gasoline oil product stabilizer, at pH of 4.66-5.83 under the normal temperature.