The present invention discloses a mobile edge platform switching method, apparatus, and system. The method includes: receiving, by a second mobile edge platform, an application identity sent by a first mobile edge platform; determining, by the second mobile edge platform, a target application instance based on the application identity; and sending, by the second mobile edge platform, a switching notification message to the target application instance, where the switching notification message is used to notify the target application instance that user equipment needs to switch to the second mobile edge platform, and the target application instance provides a service for the user equipment. According to the mobile edge platform switching method, apparatus, and system in embodiments of the present invention, after the user equipment switches from the first mobile edge platform to the second mobile edge platform, the second mobile edge platform can provide a low-latency and high-bandwidth service for the user equipment by using the target application instance. This ensures service continuity of the user equipment and improves user experience.