Disclosed are a method for adjusting a video parameter based on voiceprint recognition, a device for adjusting a video parameter based on voiceprint recognition and a readable storage medium, where the method includes: during a video program is displayed on a smart terminal, receiving audio information collected by a voiceprint data collection module; in a determination that a voiceprint feature library includes target preset audio information corresponding to the audio information, determining user identity information and user mood information corresponding to the audio information based on the target preset audio information; acquiring an adjustment parameter of a parameter adjustment mode corresponding to the user mood information, and acquiring an adjustment ratio corresponding to the parameter adjustment mode based on the user identity information; and adjusting a video playback parameter of the smart terminal based on the adjustment parameter and the adjustment ratio.