The invention belongs to the converter control technical field and relates to a dead zone adjustment control method suitable for the soft start of a dual active bridge. The method can achieve wide-range starting surge current limiting. According to the technical schemes of the invention, the method includes the following steps that: 1) a switching frequency is selected, a system starts working, and initial dead zone time is selected according to the parameters of the system; 2) the voltage of a bus-bar capacitor is collected and fed back to the primary side of the DAB (dual active bridge); 3)time dt is calculated according to a formula described in the descriptions of the invention; and 4) dead zone time is adjusted, charging is continuously carried out until pre-charging is terminated.