Disclosed is a SIM card protection device, wherein the SIM card is fixed on the SIM card seat in the mobile terminal so that it cannot be taken out normally. The device can cooperate with the card locking software of the mobile terminal to realize double protection of the SIM card, and even if the card locking software in the mobile terminal is cracked illegitimately, because the SIM card cannot be taken out normally in the deadlock state, the security of the mobile terminal is greatly improved and the legitimate rights of the operators and the mobile terminal manufacturers are protected.
