Multi-card mobile terminal and service switching method and device thereof

The invention provides a multi-card mobile terminal and a service switching method and device thereof. The service switching method of the multi-card mobile terminal comprises the steps that when network mode switching is conducted, data transmission paths executing multi-card services in a current network mode are switched to data transmission paths in a target network mode; a mapping relation between service identifiers of corresponding user identification cards and the data transmission paths in the current network mode is updated into a mapping relation between the service identifiers of the corresponding user identification cards and the data transmission paths in the target network mode; and the multi-card services are conducted on the basis of the updated mapping relation between the service identifiers and the data transmission paths in the target network mode. According to the scheme, when the network mode changes, continuity of the multi-card services of the multi-card mobileterminal which conducts the multi-card services through the same data transmission path can be achieved.