The embodiment of the invention discloses a starting-up and network selection method and device for a mobile terminal. The method comprises the following steps of: obtaining local PLMN information determined by hardware configuration information of the mobile terminal and environmental PLMN information determined by air interface information obtained after the mobile terminal is started up; generating corrected PLMN information according to the local PLMN information and the environmental PLMN information; and executing a starting-up and network selection process of the mobile terminal according to the corrected PLMN information. According to the invention, the technical problems of too-long starting-up and network selection time, low network selection efficiency and high power consumption in the existing starting-up and network selection technology when the mobile terminal is roamed to other places can be solved; therefore, the starting-up and network selection time of the mobile terminal is greatly reduced; the starting-up and network selection efficiency is increased; the existing starting-up and network selection technology of the mobile terminal can be optimized; and the increasing personalized and convenient starting-up and network selection requirements of people to the mobile terminal can be satisfied.