The invention relates to a triple bus-bar connecting method of DC thawing current, which comprises the following steps that: three DC output triple bus-bars of a DC thawing device are erected along an enclosing wall of an electric substation; connection knife switches GM arranged on a DC bus lead 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, six connection knife switches 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.