The invention relates to an auxiliary lubricating tool, in particular to an automatic oiling device of a revolving main chain of a bottle blowing machine. The automatic oiling device comprises an electromagnetic lubricating pump, compressed air hoses, a vibration filter part and multi-head rotating nozzles, wherein the vibration filter part is in a quadrangular prism shape and is provided with an oil inlet and two oil outlets; a vibrator is arranged at the bottom of the vibration filter part; the electromagnetic lubricating pump is connected with the oil inlet of the vibration filter part through one compressed air hose; the oil outlets are respectively connected with the multi-head rotating nozzles through the compressed air hoses; first screw threads are respectively formed in the inner side surfaces of the oil inlet and the oil outlets; the outer side of each port extends outwards to form a protruding edge; limiting holes are axially formed in the protruding edge of the oil inlet; and limiting holes are axially formed in the protruding edge of each of the oil outlets. The automatic oiling device has the advantages of being novel in structure, practical and simple to operate, and needed lubricating oil can be automatically filled at set time, so that equipment can be well maintained, and the halting problem, the quality problem and the like can be solved.