Method and system for controlling illumination, wifi controller and lighting device

The invention discloses a method and system for controlling illumination, a wifi controller and a lighting device. The method for controlling illumination comprises the steps that: the lighting device is connected to the wifi controller through a wifi signal; the lighting device receives an SSID (Service Set Identifier) and a secret key of a wifi wireless router sent from the wifi controller; the lighting device stores the SSID and the secret key of the wifi wireless router; and the lighting device is connected to the wifi wireless router through the SSID and the secret key of the wifi wireless router. Through the invention, wifi communication between the wifi wireless router and the lighting device is realized, the problem that the wireless illumination control is relatively fussy in the prior art is solved, and the control on the wireless illumination is simplified.