Night-time economy is an important indicator to measure the level of regional economic development. Accurately measuring and evaluating the level of night-time economy is of great significance to promote consumption upgrading and economic growth. Under the background of digitalization, e-commerce and digital technology have greatly expanded the scene and market of night consumption. In this paper, on the basis of defining the connotation of night-time economy, the key elements of its development are determined. We construct and verify the night-time economy development evaluation index system from five dimensions: Environmental Basis, Convenience of Consumption, Vitality of Consumption, Quality Evaluation of Development and Network Attention. In the selection of index data, the method of multi-source data fusion analysis is adopted to integrate statistical data, night light data and data from the Internet platform to jointly measure and evaluate the development of night-time economy.