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As the capacity of various electrical equipment increases, the demand for high-power power supplies becomes more and more urgent. As the large-capacity single-unit power supply technology is not yet mature, parallel operation of multiple power supply modules has become one of the effective means to solve the current practical needs. For parallel DC power systems, it presents an improved digital average current algorithm based on master-slave control of power supply module. Based on the master-slave control, the algorithm limits the maximum output current of the main module and the main module adopts soft-start control when the circuit starts up, so that the output voltage rises step by step, which reduces the failure of the main module in the master-slave control of the parallel power supply, the probability of a system crash. According to the circuit characteristics of different power supply modules, the power supply module with slow system response time is set as the master module, and the PWM adjustment rate of the slave module is set greater than that of the master module, which can reduce the influence of the PID parameter on the stability of each power supply module and can reduce the actual PID parameter debugging time. The experimental results show that the improved algorithm can achieve better system stability and high current sharing accuracy. The average current error is less than 1.5% and the hardware circuit design is simple.