The invention provides a control method for a battery energy storage system tracking wind-light planned output based on model prediction control, aiming at the problems of huge impact and influence onsafety, stability, electric energy quality and the like of a power grid and the occurrence of wind-solar power abandoning phenomena caused by the facts that a wind power plant and a photovoltaic power station have the characteristics of randomness and intermittency and the actual generated power of the power plants cannot track the planned generated power. The control method improves the plannedoutput tracking capacity of an energy storage system in a wind and photovoltaic energy storage combined power generation system, smoothes wind and photovoltaic combined power generation output, playsa role in peak shaving and valley filling, and improves the wind and photovoltaic power generation utilization rate. The control method comprises the steps of: acquiring day-ahead power planned outputdata of the wind power plant and the photovoltaic power station, establishing an energy storage system power output model, planning a reference model trajectory, establishing an energy storage systemoutput closed-loop prediction model, performing rolling optimization on a control algorithm, calculating a control quantity satisfying minimization of a tracking desired trajectory optimized objective function, thereby realizing precise control of the energy storage system in tracking wind-light planned output.