Provided by the embodiments of the present invention are a method, apparatus and device for switching a network format, the method comprising: acquiring a network format switching instruction comprising a target priority, the network format switching instruction being used to instruct a terminal device to switch to a target network whose format is a target format, the priority of the target network being greater than the priority of the network in which the terminal device is currently located; and releasing a network link between the terminal device and a currently accessed first base station, intercepting and buffering application layer data to be sent by the terminal device, discarding a page message of a packet switching (PS) domain that is sent by a network having a first priority tothe terminal device, and switching to the target network. The present invention is used to improve the reliability of network switching.