In order to solve the large industrial park carbon emissions caused by the concentration of environmental degradation. A model of integrated energy supply system for large industrial park was proposed, which contains three modules: energy input, energy conversion and energy storage. Energy conversion was used to reduce the proportion of traditional energy usage, and provide electricity, heat, cold and gas for the park. Calculate the carbon emissions of equipment and energy based on the life cycle, and absorb the existing carbon emissions through carbon capture technology. Taking the economic cost, total carbon emission and clean energy utilization rate as the objective function, the improved sparrow search algorithm (ISSA) algorithm was used to optimize the configuration of the integrated energy supply system in the industrial park. The results show that after the introduction of energy storage system and power to gas (P2G) system, the proportion of clean energy use in the energy system of the park is 3.92 times higher than that before. The carbon emission coefficient under unit electricity consumption is reduced by 30.2%. Comprehensive unit electricity price reduced by 0.38 yuan. It is concluded that the integrated energy supply system not only meets the energy demand of the park, but also reduces carbon emissions and economic input.