The invention belongs to the technical field of granulator machinery, in particular to a granulator lubrication system. The granulator lubrication system is applied to a granulator with a fuel conveying hole and a reflux groove and comprises a fuel tank, wherein a fuel inlet and a fuel outlet are formed in the fuel tank; the fuel outlet communicates with the fuel conveying hole through a first pipe, the reflux groove communicates with the fuel inlet through a second pipe, a first fuel pump and a first cutoff valve are arranged on the first pipe, and a second fuel pump and a second cutoff valveare arranged on the second pipe; and the first pipe between the first cutoff valve and the fuel conveying hole communicates with the second pipe between the second fuel pump and the second cutoff valve through a third pipe, the first pipe between the first cutoff valve and the first fuel pump communicates with the fuel inlet through a fourth pipe, and a third cutoff valve and a filtering device are arranged on the fourth pipe. The full automatic operation of the granulator lubrication system can be achieved, the defect that the manual refueling needs stop for refueling is avoided, the impurities in the lubricant can be automatically cleaned up, the normal operation of the equipment is effectively protected, and the maintenance frequency is reduced.