The invention discloses a DC microgrid power accurate distribution and bus voltage deviation optimization control method. Virtual impedance is introduced into traditional droop control to adjust bus voltage so as to change converter output power; the voltage-power self-adaptive droop control introduces a self-adaptive virtual resistor, and solves the problem that a DG unit cannot output load poweraccording to a capacity ratio caused by inconsistent line impedance parameters. The current-voltage self-adaptive droop power accurate distribution control strategy can quickly achieve balance underthe condition that proportional output power is guaranteed under the condition that the load suddenly increases, and a voltage reference value is effectively tracked through voltage and current double-closed-loop control. The bus voltage optimization control is to compensate the bus voltage and reduce the deviation. Based on the self-adaptive droop control technology, the problem of inaccurate power distribution and bus voltage deviation caused by inconsistent line resistance parameters during operation of the direct-current microgrid is solved, and the use efficiency of the DG is effectivelyimproved.