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The stability of short-wave transmitter power has always been a key issue in the field of communication. The instability of short-wave transmitter power will directly affect the quality of radio communication, resulting in communication distortion and unclear expression. Aiming at the above problems, a shortwave transmitter power control system is designed based on software calibration. The system draws on the MVC design mode to build the basic framework of the system database layer, business logic layer, control layer and interface display layer; connects the power meter with the shortwave transmitter, collects the power data of the shortwave transmitter under working conditions in real time, and implements it through the signal processor. After processing and storing, refer to the transmission element, send the data to the controller, calibrate the deviation between the shortwave transmitter power and the expected through the controller, take the deviation as the input, use the improved PID operation to obtain the control value, and generate the control command, Through the input and output signal interface board output commands, control the drive device to adjust the operating parameters of the short-wave transmitter, to achieve power control. The results show that compared with the application of "N+1" control system and automatic tuning system, under the application control of the designed system, the goodness of fit index between the power variation curve of the shortwave transmitter and the expected curve within 100s is larger, Closer to 1, better than the comparison system, indicating that the comparison system is compared. The control performance of the system is better, and the power of the short-wave transmitter can be maintained more stable, which achieves the research goal.