The present invention discloses a device and a method for identifying the social relations of users and a terminal device. According to the present invention, the Wi-Fi connection information of terminal devices used by the users within a predetermined scene period is collected, a scene Wi-Fi corresponding to each terminal device in a predetermined scene is identified according to the Wi-Fi connection information, and it is determined that the users using the terminal devices corresponding to the same scene Wi-Fi have a first-level contact relation. In this way, the first-level contact relations among the users can be identified based on the collected Wi-Fi connection information of the terminal devices used by the users, thereby solving the problem that in an existing technology for identifying the social relations of the users, because of the relatively single source of social data, the social relations of the users cannot be accurately obtained in the absence of social data.