A method for controlling a screen backlight of a mobile terminal, the mobile terminal comprising a fingerprint module, the method comprising: detecting (S101, S202), based on that a system wake-up event is detected by the mobile terminal, whether a TouchDown event generated in response to a touch operation on the fingerprint module exists; and detecting (S102, S203), in response to that the TouchDown event is detected, whether the screen backlight is lit up upon elapse of a preset period, the starting time of the preset period is the time point of occurrence of the TouchDown event, the preset period being longer than duration of fingerprint unlocking processing performed in response to the TouchDown event by the mobile terminal; the method further comprising: performing, in response to the TouchDown event, a first operation and a second operation in parallel, the first operation being an operation of waking up a system via power, the second operation being an operation of performing a first transparency processing on a lock interface, and the lock interface subjected to the first transparency processing being transparent and displayed; the method being characterised in that it further comprises: performing, based on that fingerprint data collected by the fingerprint module is unsuccessfully matched, a third operation and a fourth operation in parallel, the third operation being an operation of performing a second transparency processing on the lock interface, the lock interface subjected to the second transparency processing being opaque and displayed, the fourth operation being an operation of detecting whether the second transparency processing has been completed, and controlling the screen backlight to be lighted up based on that the second transparency processing has been completed and the screen backlight is not lit up. detecting (S101, S202), based on that a system wake-up event is detected by the mobile terminal, whether a TouchDown event generated in response to a touch operation on the fingerprint module exists; and detecting (S102, S203), in response to that the TouchDown event is detected, whether the screen backlight is lit up upon elapse of a preset period, the starting time of the preset period is the time point of occurrence of the TouchDown event, the preset period being longer than duration of fingerprint unlocking processing performed in response to the TouchDown event by the mobile terminal; the method further comprising: performing, in response to the TouchDown event, a first operation and a second operation in parallel, the first operation being an operation of waking up a system via power, the second operation being an operation of performing a first transparency processing on a lock interface, and the lock interface subjected to the first transparency processing being transparent and displayed; the method being characterised in that it further comprises: performing, based on that fingerprint data collected by the fingerprint module is unsuccessfully matched, a third operation and a fourth operation in parallel, the third operation being an operation of performing a second transparency processing on the lock interface, the lock interface subjected to the second transparency processing being opaque and displayed, the fourth operation being an operation of detecting whether the second transparency processing has been completed, and controlling the screen backlight to be lighted up based on that the second transparency processing has been completed and the screen backlight is not lit up. performing, in response to the TouchDown event, a first operation and a second operation in parallel, the first operation being an operation of waking up a system via power, the second operation being an operation of performing a first transparency processing on a lock interface, and the lock interface subjected to the first transparency processing being transparent and displayed; the method being characterised in that it further comprises: performing, based on that fingerprint data collected by the fingerprint module is unsuccessfully matched, a third operation and a fourth operation in parallel, the third operation being an operation of performing a second transparency processing on the lock interface, the lock interface subjected to the second transparency processing being opaque and displayed, the fourth operation being an operation of detecting whether the second transparency processing has been completed, and controlling the screen backlight to be lighted up based on that the second transparency processing has been completed and the screen backlight is not lit up.