The embodiments of the present disclosure disclose a terminal device and an early warning method for the terminal device. The method includes: a terminal starts a global positioning system (GPS) positioning to acquire current geographical location information in real time, and matches the current geographical location information with geographical location information of a set region in a service area of a base station to which the terminal belongs; if a matching result is that the terminal has left the set region of the base station to which the terminal belongs, the terminal performs an early warning operation. The terminal device includes a matching unit and an early warning processing unit.