The invention discloses a main network day-ahead scheduling method of considering the active power regulation capability of active distribution networks and belongs to the technical field of electricengineering. Information collection restrictions of main network scheduling and distribution network scheduling are considered. According to the method, conventional technical parameters of the main network and the distribution networks are collected separately to obtain load prediction curves of two stages of networks; detailed modeling is carried out on the main network and the distribution networks separately; and meanwhile, a method for efficiently solving models is provided on the basis of information interaction of the main network and the distribution networks. The influence of the active power regulation capability of the active distribution networks containing energy storage on day-ahead scheduling production is fully considered, global optimization of the whole network can be achieved through the optimized scheduling scheme, the power generation cost of a generator set of the network is reduced to the maximum extent and waste of resources is reduced.