The invention discloses a migration method and system for a virtual subscriber identity module (SIM) card, a terminal and server. The method comprises the following steps: accessing a network by a communication card; sending a virtual SIM card immigration request to a virtual SIM card server; after identity authentication of the communication card of the terminal by the virtual SIM server passes, allocating a virtual SIM card associated with the communication card; and receiving parameters, which are transmitted by the virtual SIM card server, of the virtual SIM card associated with the communication card.