Abstract: To address issues of new energy accommodation and hydrogen energy storage, transportation and utilization, a grid-connected wind-solar hydrogen production and ammonia synthesis system was proposed. Based on the real data of wind and solar power throughout a year, a mathematical model of the system was developed with the optimization goal of maximizing the total system revenue. The optimal equipment capacity and operation scheduling plan of the system were determined with a mixed integer linear programming algorithm. Results show that the proposed new system can switch working states reasonably and achieve energy balance according to changes in wind and solar resources and electricity prices. Under the condition of satisfying various constraints, the utilization rate of renewable energy is improved, and the levelized cost of system ammonia production is reduced.