Abstract: A manufacturing method of wing nuts has a round metal wire cut into segments used as billets. The method includes a basic formation directly forging the billet to become a primary body consisting of an intermediate head and two curved wings connected with two ends of the intermediate head respectively, a wing trigging employed for forging the wings of the intermediate head to become butterfly wings with a curved edge and an edge formation effected by forging the intermediate head to form a positioning groove in the center of the top and the bottom side respectively. Then the semi-finished product is finished by drilling and threading. By this method, manufacturing processes can be shortened to obtain a rapid producing rate and lessen waste volume, lowering cost and advancing competition.