Abstract: The proportion of coal remains high in Chinese energy production and consumption structure, posing a significant challenge for the transition towards clean and low-carbon energy. However, new energy sources such as wind and solar power have poor stability and face difficulties in local consumption, highlighting the urgent need for large-scale energy storage infrastructure. Meanwhile, with the increasing focus on high-quality development and the “dual carbon” goals, the number of abandoned mines is growing. To improve the utilization rate of abandoned mine space and enhance the stability and reliability of renewable energy generation, a wind-solar storage combined power generation system based on abandoned mine gravity energy storage is proposed. Taking into account the characteristics of the energy system load in mining areas, the conditions of renewable energy sources such as wind and solar power, and the advantages of large-scale physical energy storage in abandoned mines, a wind-solar gravity energy storage combined power generation system is designed. Taking the minimum net present cost （NPC） of the system as the objective function, a parameter optimization model for the wind-solar gravity energy storage combined power generation system is proposed. The charging and discharging power of the gravity energy storage station, the interactive capacity between the system and the grid, and the annual renewable energy generation rate are considered as constraints for the decision optimization of the capacities of photovoltaic stations, wind power stations, and gravity energy storage stations. Based on the actual engineering background of the Panyi Mine in Huainan, an case analysis is conducted using the HOMER simulation software. The results show that the case is optimal under the cyclic charging and discharging control strategy, with the lowest net present cost of the wind-solar gravity energy storage parameters and the highest annual renewable energy generation rate. This approach effectively enhances the complementary characteristics of wind and solar power, as well as the stability and reliability of the system, providing reference for the parameter optimization of wind-solar gravity energy storage combined power generation systems.