A processing method for terminal access to a 3rd Generation Partnership Project, 3GPP, network comprising: sending, by a terminal, an access request message to a core network device on a 3GPP network, wherein the access request message is used to request to access the 3GPP network, and the access request message comprises identity information of the terminal; receiving, by the terminal, an unauthorized access message from the core network device, wherein the unauthorized access message is used to indicate that the terminal is unauthorized to access the 3GPP network and wherein the unauthorized access message comprises authentication information of the core network device; performing, by the terminal, authentication on the core network device according to the authentication information; and executing, by the terminal, a corresponding network access policy after authentication on the core network device by the terminal succeeds, wherein the executing a corresponding network access policy after authentication on the core network device by the terminal succeeds comprises: stopping, by the terminal, an attempt to access the 3GPP network, and attempting to access the 3GPP network again when a status of the terminal satisfies a first preset condition, wherein the first preset condition comprises at least one of the following: a subscriber identity module, SIM, card of the terminal is changed, the terminal restarts, duration of timing starting when an attempt to access the 3GPP network by the terminal fails exceeds first preset duration, or the terminal reselects a non-3GPP network. sending, by a terminal, an access request message to a core network device on a 3GPP network, wherein the access request message is used to request to access the 3GPP network, and the access request message comprises identity information of the terminal; receiving, by the terminal, an unauthorized access message from the core network device, wherein the unauthorized access message is used to indicate that the terminal is unauthorized to access the 3GPP network and wherein the unauthorized access message comprises authentication information of the core network device; performing, by the terminal, authentication on the core network device according to the authentication information; and executing, by the terminal, a corresponding network access policy after authentication on the core network device by the terminal succeeds, wherein the executing a corresponding network access policy after authentication on the core network device by the terminal succeeds comprises: stopping, by the terminal, an attempt to access the 3GPP network, and attempting to access the 3GPP network again when a status of the terminal satisfies a first preset condition, wherein the first preset condition comprises at least one of the following: a subscriber identity module, SIM, card of the terminal is changed, the terminal restarts, duration of timing starting when an attempt to access the 3GPP network by the terminal fails exceeds first preset duration, or the terminal reselects a non-3GPP network. stopping, by the terminal, an attempt to access the 3GPP network, and attempting to access the 3GPP network again when a status of the terminal satisfies a first preset condition, wherein the first preset condition comprises at least one of the following: a subscriber identity module, SIM, card of the terminal is changed, the terminal restarts, duration of timing starting when an attempt to access the 3GPP network by the terminal fails exceeds first preset duration, or the terminal reselects a non-3GPP network.