The invention discloses an active power distribution network distributed new energy day-ahead active scheduling plan generation method, which relates to the field of power system scheduling automation. The method comprises the following steps of: acquiring day-ahead load prediction and new energy power generation prediction data of a target power distribution network by taking 15 minutes as a period, and finishing forecast power flow calculation by taking 15 minutes as a section to obtain forecast power flow data of a branch gateway of the target power distribution network, optimizing a targetpower distribution network energy storage plan according to a tide upper and lower limit target curve of the set branch gateway and generating a day-ahead energy storage plan curve, and comprehensively considering day-ahead load prediction, new energy power generation prediction data and the day-ahead energy storage plan curve to generate plan curve data of the branch gateway of the target powerdistribution network and completing day-ahead active scheduling planning. According to the method, the influence of power distribution network loss is fully considered, and the accuracy of gateway forecast power flow data and day-ahead active scheduling planning is improved; and the network access loss is reduced, and the optimized economic scheduling of the power distribution network is realized.