The invention provides a screen unlocking method and unlocking device for a terminal. The terminal comprises a first operation system and a second operation system. The screen unlocking method comprises following steps: when receiving an instruction for unlocking the locked screen of the terminal, identifying whether the operator of the terminal is an authorized user; if the operator is identified as the authorized user, simultaneously displaying an unlocking interface corresponding to the first operation system and an unlocking interface corresponding to the second operation system; and if the operator is not identified as the authorized user, only displaying the unlocking interface corresponding to the first operation system. According to the method and the device provided by the invention, different unlocking interfaces are displayed according to the identities of the operators of the terminal; the unlocking interfaces corresponding to the two operation systems are prevented from being displayed to all operators; therefore, an unauthorized user is prevented from knowing the security operation system and obtaining the data in the security operation system maliciously; and the security of the data in the security operation system is effectively protected.