Self-lubricating device of machine tool spindle

The utility model relates to the technical field of spindle lubrication, and discloses a self-lubricating device of a machine tool spindle, which comprises a shell, a spindle body is arranged in the shell, an oil storage ring is sleeved at the front end of the outer wall of the shell, and a mounting cavity is arranged in the shell. When the self-lubricating device of the machine tool spindle is used, lubricating oil is conveniently poured into the oil storage ring through the oil inlet hole, when the spindle is started to rotate, the lubricating oil is conveniently conveyed into the oil outlet pipe along with the flow dividing pipe by opening the control valve, and the lubricating oil is conveniently conveyed to the oil absorption cotton block through the oil outlet pipe. When the main shaft rotates to drive the bearing to rotate together, the oil absorption cotton block can absorb lubricating oil and release the lubricating oil to the surface of the bearing, so that direct contact between metals is reduced,