The invention relates to the technical field of transformation-station secondary system configuration, in particular to a transformer-station secondary-system configuration scheme constructing method based on a design specification. The method includes he steps that the design specification of an intelligent transformer station is subjected to logical processing to generate intelligent-transformer-station design specification execution logic; the types, the models, the number and the serial numbers of required primary devices are selected according to practical conditions of the transformer station, and the intelligent-transformer-station design specification execution logic is run to generate a corresponding secondary-device configuration result; configurable naming specifications provided by different scheduling mechanisms are subjected to logical processing to generate naming specification execution logic; the naming specification execution logic is run, and configured secondary devices are named and described to generate a transformer-station secondary-system configuration scheme. The information of the required primary devices is selected, and a computer can automatically generate the secondary device configuration result. The workloads of an engineer are greatly reduced, the complex secondary-device inputting process is avoided, working efficiency is improved, and the configuration error rate is also reduced.