The invention discloses a screen brightness regulating method and apparatus. The method comprises the following steps of: A, monitoring a change condition of an external environment where user equipment is positioned, and generating a monitoring result; B, according to the monitoring result, acquiring an environment light brightness value, wherein the environment light brightness value is a brightness value of light in the external environment; C, according to the environment light brightness value, judging whether brightness of the light in the external environment accords with a preset condition, and generating a first judgment result; and D, under the condition that the first judgment result is that the brightness of the light in the external environment accords with the preset condition, regulating brightness of a screen of the user equipment. According to the screen brightness regulating method and apparatus disclosed by the invention, the brightness of the screen can be adaptively regulated according to the external environment where the user equipment is positioned.