The invention discloses a smart earphone device individualizing system with a directional conversation function and a using method. A user downloads an earphone individualizing application unit and installs the same in a mobile device by a servo device, pairs the mobile device and a smart earphone device, and then inputs corresponding data into the registration module of the mobile device. Then, the user must wear the smart earphone device, and the hearing detection module of the mobile device detects the hearing of the left and right ears of the user and generates a detection result. The automatic compensation unit and the manual compensation module of the smart earphone device compensate according to the detection result. Finally, the user can adjust a sound mode through the preference setting module of the mobile device according to a personal preference to individualize the smart earphone device. The individualized smart earphone device can amplify the voice of a person in front ofthe user by the directional conversation function, so that the user can clearly hear the content talked by the person and the convenience of the conversation is improved.