The present invention relates to the field of intelligent home and discloses a method, a device and a system for adjusting light in an environment. The method comprises a step of monitoring a human body physiological parameter through a sensor, a step of judging the adjustment of the light in the environment is needed according to the monitored human body physiological parameter, and a step of sending light adjustment related data to connected terminal equipment when the need of adjusting the light in the environment is determined. According to the invention, the automatic adjustment of the environment light can be realized, the use of a user is facilitated, the time and effort of the user are saved, the automatic adjustment in the technical scheme is corresponding to the state of the user, and thus the adjusted light is more in accordance with the needs of the user.