The invention discloses a storage and transmission cooperative stochastic programming method considering a probability model of a wind-storage combined system. The storage and transmission cooperativestochastic programming method comprises the steps of: establishing a storage and transmission probability model containing the wind-storage combined system; performing stochastic description on a probability distribution model and injection node power; and calculating to obtain a wind-storage stochastic programming model containing the wind-storage combined system. The storage and transmission cooperative stochastic programming method comprehensively considers influence of energy storage configuration and charge-discharge strategies thereof on power transmission network planning, generates awind-storage combined output probability model, performs probabilistic load flow calculation, and establishes a stochastic programming model that considers both energy storage capacity configuration and power transmission network planning simultaneously. According to the storage and transmission cooperative stochastic programming method, wind-storage combined output range constraints and overloadconstraints are introduced into the model, the reasonable compromise between the energy storage wind power fluctuation stabilizing level and energy storage configuration cost and between the risk resisting capability of the system and line cost is realized, the weak links of the system can be comprehensively mastered, and the establishment of a flexible, economical and highly adaptable strong gridstructure is facilitated.