The invention relates to a lubricating oil base oil based on a synthetic ester compound of gallic acid. The lubricating oil base oil includes the compound shown as general formula (I), wherein R1 and R2 are independently selected from alkyl of C1-C18 respectively. The lubricating oil base oil based on the synthetic ester compound of gallic acid provided by the invention is prepared from the natural and renewable resource gallic acid, has high flash point and thermal stability, good viscosity-temperature performance, and has excellent friction reduction and antiwear properties as a lubricant of steel/steel and steel/copper friction pairs.