The invention relates to a charging-discharging control method of a cell energy storing system in a wind power plant, which belongs to the technical field of optimized computing of a power system, and comprises the steps of adopting a dual-process computing method based on a modern interior point method for resolving a model by aiming at a charging-discharging control model of a BESS(battery energy storing system) in the wind power plant under three modes of wind power peak-clipping valley-filling, power smoothing and tracking curve, thus fast and effectively resolving the charging-discharging control model and obtaining the active power value outputted by the BESS in each time period in the control time. The charging-discharging control method has better convergence and limits the charging-discharging energy of the BESS in one period, thus facilitating prolonging the service life of a cell. The active power adjusting interval of the BESS can be reduced by performing interpolation on the active power predicted data of the wind power plant, thus performing limiting on the active power fluctuation of the wind power plant in different time scales.