The invention provides a light control system and a light control method. According to the system, a light console and a wireless decoder are wirelessly connected and wireless network data are sent tothe wireless decoder according to the user's control. The wireless decoder is connected with a lighting device and is used for receiving the wireless network data; the wireless network data are parsed according to information carried by the wireless network data; and DMX light control data obtained by parsing are sent to the lighting device or and own configuration is carried out based on the configuration data obtained by parsing. The system supports wireless network data based on the Ma-net protocol and Art-net protocol. The light console is used for carrying out channel domain configuration; the system is used flexibly; DMX channel extension is carried out by adding a random number of light encoders; the restriction by the hardware DMX interface number of the light console is eliminated; and technical problems that the flexibility is low during channel domain configuration of the existing system and the restriction by the hardware DMX interface number of the light console exists can be solved.