A position-based mobile terminal power management device, includes a positioning module connected to the power management and control module; a network connection monitoring module connected to the power management and control module; a power management and control module connected to the positioning module, network connection monitoring module, storage module, and terminal function module respectively; a storage module connected to the power management and control module; and a terminal function module connected to the power management and control module. With the device, a mobile terminal can automatically enable or disable the accessory devices thereof according to the position of the mobile terminal, thus saving power and facilitating use by a user.