The invention discloses a spring brightness adjustment method and a spring brightness adjustment device. The spring brightness adjustment method includes: determining corresponding first screen brightness delay adjustment time according to a first ambient brightness interval of acquired first ambient brightness parameters; before reaching the first screen brightness delay adjustment time, if acquired second ambient brightness parameters are at a second ambient brightness interval, determining corresponding second screen brightness delay adjustment time and adjusting screen brightness of a terminal according to the second screen brightness delay adjustment time or adjusting the screen brightness of the terminal intermediately. With the method, splash screen can be avoided by delaying adjusting the screen brightness, the screen brightness can be adjusted in time with less screen brightness delay adjustment time when the ambient brightness parameters skip to the other interval from one interval, and the situation that the screen brightness is too bright or too dark due to change of the screen brightness in sudden change of the ambient brightness is avoided.