Big data of ecological environment is an important means to support scientific decision-making of ecological environment management, and plays an important role in enhancing early warning of ecological environment, preventing ecological environment health risks, and improving public service capabilities. This paper studies the construction of an ecological environment information system, uses big data technology for simulation, and combines simulation technology. The research results show that the use of big data technology helps to fully mine useful information and is committed to the precise governance of ecological and environmental problems. By strengthening data resource integration, coordinating informatization project construction, establishing information resource catalogs, and improving ecological and environmental information institutions, measures such as strengthening the grassroots ecological and environmental information construction, thereby promoting the construction and application of ecological and environmental big data, to achieve scientific and ecological decision-making.