Embodiments of this application disclose a switching method and a related apparatus. When a terminal device has a switching requirement, to sift a target network device for the terminal device, a source network device receives N pieces of data channel quality information, where the N pieces of data channel quality information are in a one-to-one correspondence with N candidate network devices, and each of the N pieces of data channel quality information is used to indicate coverage quality of a data channel between the terminal device and a candidate network device corresponding to the data channel quality information.