The invention relates to a double bus-bar connecting method of DC thawing current, which comprises the following steps that: two DC output double bus-bars of a DC thawing device are erected along an enclosing wall of an electric substation; a connection knife switch GM arranged on a DC bus leads the DC thawing current outputted by the DC thawing device to power distribution equipment near a leading-out terminal of each line which needs thawing; and the DC thawing device at least comprises a thawing power supply integrated SVC connected to the DC bus, the connection knife switch GM of the DC bus and a short-circuit knife switch GD of a DC side which form a DC thawing loop. The method has the characteristics that a cable trench space does not need occupying, the method can realize DC connection of all lines which need thawing of the electric substation and does not limit the size of DC, and the like.