Achieving method and device of emergency service

The invention discloses an achieving method and device of an emergency service. The achieving method and device are used for keeping the emergency service continuously achieved after an SIM/USIM card used in UE is pulled out. The achieving method of the emergency service includes the steps that when a user identification card does not exist in the UE, the UE initiates a Detach adherence process and initiates an Emergency adherence process; the UE reconstructs an IMS Emergency session.