The invention provides an illumination system of a smart home. The illumination system comprises an audio input module, a camera shooting module, an emotion judge module, a light adjusting module, a light illumination module, an intelligent chat module, an audio output module, a sharing social module and a central control module. The emotion judge module is used for judging emotional states of a user on the basis of voice of the user. The light adjusting module is used for controlling color and brightness of light according to the emotional states of the user, performing calculation and sending a light adjusting instruction. The intelligent chat module is used for selecting corresponding chat voice and chat styles according to instructions of the user to have an intelligent voice chat with the user. The sharing social module is used for sharing voice and video of the user to a social network according to the instructions of the user. The central control module is used for controlling the audio input module, the camera shooting module, the emotion judge module, the intelligent chat module and the sharing social module. The illumination system of a smart home adjusts emotions of the user through light and also through intelligent voice chatting.