Linear sliding rail and self-lubricating structure thereof

The invention discloses a linear sliding rail and a self-lubricating structure thereof. The linear sliding rail comprises a sliding block, a sliding rail and a self-lubricating structure. The sliding rail penetrates through the sliding block and is provided with a lubricating part. The self-lubricating structure comprises an oil tank, a self-lubricating element, a blocking piece and a pushing element. The oil tank is combined on one side of the sliding block and comprises an oil storage space and a lock column, and an adjusting hole is formed in one side of the oil tank. The self-lubricating element comprises a lubricating body and a guide hole, the lubricating body is provided with a convex lip, and the lubricating body penetrates through the lock column through the guide hole and is movably contained in the oil storage space. The blocking piece is attached to the side face, facing the adjusting hole, of the lubricating body. The advancing element is arranged in the adjusting hole. The adjusting hole and the