Synthetic ester lubricating oil composition and preparation method thereof

The invention relates to the technical field of lubricating oil, in particular to a synthetic ester lubricating oil composition and a preparation method thereof.The method comprises the following steps that S1, animal fat is cut into blocks through a machine; s2, putting the blocky animal fat into an extrusion device; s3, squeezing grease from the animal fat by using a squeezing device; s4, extruding the animal fat by using an extruding device to perform centrifugal rotation, so that residual grease in the animal fat is thrown out; s5, heating the animal fat by using an extrusion device during centrifugal rotation; s6, collecting and filtering the prepared grease by using an extrusion device; s7, adding sodium hydroxide into the filtered grease to obtain saturated fatty acid and fatty alcohol; and S8, performing esterification reaction and dehydration on the prepared saturated fatty acid and fatty alcohol under the action of a catalyst to prepare the synthetic ester lubricating oil. The method has the benefic