The invention discloses a supply voltage intelligent analysis and assistant decision-making method for power distribution networks. By the aid of the supply voltage intelligent analysis and assistant decision-making method, target lines are modeled and are subjected to load flow calculation in a simple and convenient mode, and main factors for voltage standard exceeding are found out by the aid of a voltage analysis process; the optimal solution can be provided by the aid of an assistant decision-making algorithm combined with consideration technologies. The supply voltage intelligent analysis and assistant decision-making method particularly includes steps of S1, modeling foundations; S2, analyzing voltages and finding out the main factors for the voltage standard exceeding of the target lines; S3, performing assistant decision-making and computing economic indicators under the condition that requirements of technical indicators are met and providing the optimal solution; S4, generating analysis reports. The supply voltage intelligent analysis and assistant decision-making method has the advantages that load flow can be calculated, operation is simple and feasible, and the supply voltage intelligent analysis and assistant decision-making method has low requirements on knowledge and skills; a voltage analysis function further can be implemented, and reasons for the voltage standard exceeding and corresponding solution suggestion can be visually provided.