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The requirement of high-power radio is getting higher and higher, and it requires smaller and smaller volume under the same transmitting power. This paper is based on the power supply of 1kW short-wave radio station A power supply unit with high efficiency and high power density is designed. Through the chip C8051F330 can realize the communication with the upper computer serial port, can control the power supply,It also monitors the output voltage and current of each DIRECT current and the temperature of the whole machine, and can realize the step-type eight-stage voltage for the power supply of the final power amplifier unit,The adjustment. Can automatically identify ac input undervoltage, overvoltage, can effectively protect the power supply from damage. With input undervoltage protection, input Overvoltage protection, output overcurrent protection, output short circuit protection and overtemperature protection。