The development of people's living standard is bring with the growing demand for smart home systems. With the leading of smart home requirements, this paper proposes a smart home lighting control system design based on digital twin technology. To satisfy different user needs and achieve intelligent adjustment for the optimal brightness and atmosphere in various environmental conditions, the proposed system in this paper consists of system modeling, data processing, simulation experiment and system optimization. Therefore, low cost, good controllability and convenience can be obtained compared to the traditional lighting control system, which cannot achieve a variety of functions for different user needs. In this paper, we propose a smart home lighting system based on digital twin technology and smart home system, and design a living room as a case to prove the timeliness of the system.