The invention discloses high-strength high-temperature resistant oil filter paper and a preparation method of the high-strength high-temperature resistant oil filter paper. The high-strength high-temperature resistant oil filter paper is prepared from the following materials in parts by weight: 50-60 parts of softwood pulp, 20-30 parts of polybenzimidazole fibre, 20-30 parts of high silica glass fibre, 2-5 parts of modified sepiolite, 1-3 parts of lithopone, 2-4 parts of activated clay, 1-2 parts of nanometer titania, 0.5-0.8 parts of decabromodiphenyl ether, 2-3 parts of cationic polyacrylate latex, 0.5-1 part of glycerol triglyceride acid, 0.4-0.8 parts of diethanol amide, 0.5-1 part of vinyltriethoxysilane, 0.4-0.8 parts of sodium laurylsulfate and 2-5 parts of dialdehyde starch. The filter paper prepared by the method has the advantages of good water permeability, large filter area, small maximum aperture, high filter precision, strong bursting strength, thermostability and the like, has a stable performance index at a normal temperature under a high-temperature work condition, and has better effects of temperature resistance and filtering, and filtering efficiency can be up to 99.98%.