A method for network registration, comprising: obtaining, by a multi-SIM terminal upon registering a Subscriber Identification Module, SIM, card of the multi-SIM terminal to a network, an International Mobile Equipment Identity, IMEI, and multiple International Mobile Subscriber Identities, IMSIs, of multiple SIM cards in the multi-SIM terminal; sending, by the multi-SIM terminal, the IMEI and the multiple IMSIs to a network device in the network; and receiving, by the multi-SIM terminal, a first authentication result fed back from the network device, wherein the first authentication result is used for indicating whether the SIM card is allowed to reside in the network; wherein the network device comprises a management device, and the management device is a Mobility Management Entity, MME, and wherein sending, by the multi-SIM terminal, the multiple IMSIs to the network device in the network comprises: generating, by the multi-SIM terminal, an attach request, wherein the attach request carries the multiple IMSIs, and the attach request comprises a first field and a second field, the first field indicating an IMSI of currently-registered SIM card, and the second field indicating the IMSI of a SIM card other than the currently-registered SIM card; and sending, by the multi-SIM terminal, the attach request to the management device; or, the network device comprises a management device, and the management device is an Access and Mobility Management Function, AMF, and wherein sending, by the multi-SIM terminal, the multiple IMSIs to the network device in the network comprises: generating, by the multi-SIM terminal, a registration request, wherein the registration request carries the multiple IMSIs, and the registration request comprises a third field and a fourth field, the third field indicating an IMSI of currently-registered SIM card, and the fourth field indicating the IMSI of a SIM card other than the currently-registered SIM card; and sending, by the multi-SIM terminal, the registration request to the management device. obtaining, by a multi-SIM terminal upon registering a Subscriber Identification Module, SIM, card of the multi-SIM terminal to a network, an International Mobile Equipment Identity, IMEI, and multiple International Mobile Subscriber Identities, IMSIs, of multiple SIM cards in the multi-SIM terminal; sending, by the multi-SIM terminal, the IMEI and the multiple IMSIs to a network device in the network; and receiving, by the multi-SIM terminal, a first authentication result fed back from the network device, wherein the first authentication result is used for indicating whether the SIM card is allowed to reside in the network; wherein the network device comprises a management device, and the management device is a Mobility Management Entity, MME, and wherein sending, by the multi-SIM terminal, the multiple IMSIs to the network device in the network comprises: generating, by the multi-SIM terminal, an attach request, wherein the attach request carries the multiple IMSIs, and the attach request comprises a first field and a second field, the first field indicating an IMSI of currently-registered SIM card, and the second field indicating the IMSI of a SIM card other than the currently-registered SIM card; and sending, by the multi-SIM terminal, the attach request to the management device; or, the network device comprises a management device, and the management device is an Access and Mobility Management Function, AMF, and wherein sending, by the multi-SIM terminal, the multiple IMSIs to the network device in the network comprises: generating, by the multi-SIM terminal, a registration request, wherein the registration request carries the multiple IMSIs, and the registration request comprises a third field and a fourth field, the third field indicating an IMSI of currently-registered SIM card, and the fourth field indicating the IMSI of a SIM card other than the currently-registered SIM card; and sending, by the multi-SIM terminal, the registration request to the management device.