Backlight brightness adjustment method and device

The invention provides a backlight brightness adjustment method and a device. The backlight brightness adjustment method comprises steps of obtaining a capacitance value on a screen of a terminal when the fact that the terminal enters the unlocking interface is detected, generating a brightness regulation order if the capacitance value on the screen is determined to be greater than a preset threshold, determining a corresponding regulation mode according to the brightness regulation order and performing regulation on the current backlight of the screen according to the regulation mode. The invention can automatically regulate the brightness of the backlight, provides convenient operation and improves the flexibility.