A method and device for network/card locking of a mobile terminal, a terminal, a Subscriber Identity Module (SIM) card and a storage medium are provided. The method for card locking of a mobile terminal includes that: encrypted data sent by a mobile terminal is received; it is authenticated, according to the encrypted data, whether the mobile terminal can initialize a SIM card, and an authentication result is obtained; and the authentication result indicating whether the mobile terminal can initialize the SIM card is returned to the mobile terminal.