A charging system switching method and an apparatus such that an online charging system or a customer relationship management system may initiate charging system switching of a specific service, and may switch any service from an original charging system to a new charging system in real time, without switching all users on the original charging system onto the new charging system. Therefore, a smooth switching between multiple charging systems is supported, and in addition, multiple charging systems may perform charging for different services of a same user, thereby implementing coexistence of different charging systems.