This paper studies the high-power phase-shifted full-bridge converter, and designs the FPGA-based digital control method for the circuit topology. The system control strategy of switching power supply is given, and many key technologies based on FPGA of the power supply digital control system such as digital PI algorithm, digital control system program architecture, and the method of processing floating-point operation are explained. A digital control power supply prototype with a rated power of 6kW was built, a number of functional performance tests were carried out, and the expected design indicators of the switching power supply were achieved. Experimental results show that the FPGA-based digital control system can not only ensure the stable operation of the switching power supply, but also have great advantages in operation speed and event parallel processing. This technology is not limited to the phase-shifted full-bridge circuit topology, and can be applied to other switching power supply topology circuits by appropriately adjusting the modulation and control strategy.