A roaming signaling message sending method, where after receiving a roaming signaling message, a visited core network device adds an identifier of a home core network device and an identifier of a visited SEPP into the roaming signaling message, and then sends a roaming signaling message including the identifier of the home core network device and the identifier of the visited SEPP to the visited SEPP, such that the visited SEPP can forward the roaming signaling message to a home network based on the identifier of the home core network device.