Abstract: The present invention relates to a propelling pencil having such a lead feeding mechanism that may feed out the lead automatically by a pressing force and a friction force. A pencil head in which a pencil point is disposed threadly engages with the front end of an outer sleeve that fits over an inner sleeve with clearance fit. The back end of the inner sleeve fits over the front end of a propeller with clearance fit. A damping tube in which a pair of lock sheets is disposed is provided in the back part of the pencil point. Two lock sheets cooperate with each other so that their front ends and back ends may open and close around a mortar and a socket at the center part thereof. The front end of the lock sheet is a locking point for lead feeding, which makes the next lead on the back lie in a following state under the action of gravity, effectively avoiding jam and eliminating noise.