The present invention relates to an automatic lubricating oil supply device. In particular, the drive shaft of the automatic lubricating oil supply device is connected to a drive shaft of a rotating machine to supply lubricating oil without a separate driving motor, and thus the lateral reciprocating movement of the plunger shaft by cam motion. Accordingly, the lubricant is automatically transferred from the lubricating oil tank to the pump chamber according to the volume difference in the pump chamber generated by the positional change of the gap formed in the flanger shaft, and the transferred lubricant is raised to the lubricating oil discharge pipe side by the specific gravity difference by glycerin. In this way, the appropriate amount of lubricant can always be automatically supplied to the rotating machine through the discharge pipe, so that the automatic lubricant supply device, which always supplies a certain amount of lubricant automatically, can be operated at a low installation and operation cost.
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