Power cable repair operation method

The invention relates to the technical field of power system maintenance, in particular to a power cable repair operation method, which comprises the following steps that: a bracket is driven by a submersible to move to a position above a damaged cable, and then the submersible drives the bracket to descend so that the bracket covers the cable; the driving device drives the two rotating shells to rotate and be closed, and the sealing shell is attached to the rotating shells through attraction force of the first magnet and synchronously rotates along with the rotating shells. After the two sealing shells are closed, the melting device is started, the joint between the two sealing shells is connected in a melting mode through the melting device, then the gas supply device is started, the gas supply device pumps gas into the sealing shells, and seawater in the sealing shells is discharged through the liquid discharge valve; and then the gas supply device stops, the liquid supply device starts, the liquid supply