The invention discloses an automatic control method for the ambient illumination based on feedforward prediction, which comprises the steps of firstly confirming that control equipment and controlledequipment are in the same room, then obtaining an initial brightness threshold and an initial darkness threshold of the environment, judging whether the ambient light has an abrupt change or not and the changing trend of the ambient light after learning over two days, learning the work and rest time of a user, learning a brightness threshold, a darkness threshold and a blackness threshold of the user, performing automatic control according to the learned brightness threshold and darkness threshold, and correcting according to operating habits of the user. The beneficial effects are that the automatic control method not only can execute automatic lamp switching according to light habits of the user so as to save the tedious manual switching, but also can perform automatic control accordingto the variation of the ambient light so as to save resources through adopting the combination of automatic control and manual adjustment.