A method of manufacturing a fiber optic ferrule device, comprising steps of: providing a ferrule assembly; inserting a fiber into a fiber bore of the ferrule assembly until the fiber protrudes a predetermined distance from a front end surface of the ferrule assembly; and filling an adhesive into the ferrule assembly, so that the adhesive flows into the fiber bore and holds the fiber in place in the fiber bore after the adhesive is cured. The fiber is easily and smoothly inserted through the ferrule assembly, and the risk that the fiber is damaged by the adhesive is avoided. Also, the fiber protruding from the front end of the ferrule assembly is not adhered with any adhesive.