The invention provides a power saving mode control method and a power saving mode control device. The power saving mode control method is applied to a terminal. The control method comprises steps: whether an idle state is entered at a current moment is detected; if the idle state is entered, an activation timer is started, wherein the activation timer adopts a numerical value when a first power saving mode is entered before the current moment; and when the activation timer exceeds time, a second power saving mode is entered. According to the scheme of the invention, a power saving mode can be applied for one time and constantly defaulted to be valid, the terminal wakes up from the power saving mode each time, when a power saving mode needs to be entered again, repeated transmission of signaling for application is not needed, the signaling overhead is thus reduced, and the aerial interface resources are saved.