The invention discloses a pencil sharpener. The pencil sharpener comprises a shell, a knife seat and a knife, wherein the knife is connected on the knife seat; a conic chamber, a lead discharge hole and a conic pencil sharpening hole are formed in the knife seat; the blade edge of the knife is positioned at a scrap discharge gap of the conic sharpening hole; the blade tail of the knife fixed on the knife seat is arranged at the lead discharge hole; a lead sharpener which is fixed on the knife seat is arranged on one side of the lead discharge hole; a lead discharge length limiting baffle is arranged at the tail of the lead discharge hole; a lead repairer is arranged on one side of the knife seat and a polisher is arranged below a positioner of the lead repairer. A conic or cylindrical pencil refill can be obtained by regulating the working position of the lead sharpener on the knife seat, wherein the cylindrical pencil refill is always a 2B type pencil used for filling a mark-sense form. A sharpened 2B pencil is inserted into the lead repairer to be moved and ground to obtain a flat lead refill which is convenient for filling the mark-sense form, so that the defects of insufficient functions of the conventional pencil sharpeners are overcome.