The invention discloses a method for automatically generating a thermal-control power supply cabinet wiring diagram for an electric power plant, wherein the method is based on the thermal-control design technology and the computer technology and takes EXCELVBA as a design platform. The method comprises the following steps: a. inputting an electrical load list in the thermal-control specialized field; b. inputting preset parameters of a rule; c. generating a configuration list for a power supply cabinet system according to the electrical load list and the rule; and d. generating a wiring diagram for the power supply cabinet system in an EXCEL format, and generating an equipment material list, an electric cable outgoing wire list and an electric cable detailed list in EXCEL software. With the adoption of the method for automatically generating the thermal-control power supply cabinet wiring diagram for the electric power plant disclosed by the invention, the system diagram and the wiring diagram of a power supply cabinet in the EXCEL format or an AutoCAD format can be automatically generated, so that the method has the advantages of time saving and labor saving, shortening the working period and greatly increasing the work efficiency.