The invention relates to a repairing method for heat exchange tube of a graphite heat exchanger, and belongs to the technical field of graphite heat exchangers. A plugging device, a detection head, anindustrial control computer and plugs are included, during leakage point detection, the plugging device is installed at one side of the heat exchanger, the detection head is inserted into the heat exchange tube at the other side of the heat exchanger, and the detection head is connected with the industrial control computer; vacuum pressure-maintaining test can be carried out on the heat exchangetubes one by one, states of the heat exchange tubes are determined according to pressure increase conditions, a damaged heat exchange tube can be discovered timely, and the first and second plugs arearranged at the two ends of the damaged heat exchange tube, and are connected with each other via a connection rope. The problem that the damaged heat exchange tube is hard to find in the maintenanceprocess of the graphite heat exchanger is solved, the two ends are plugged by the plugs, high cost of replacing the single heat exchange tube can be avoided, and the maintenance cost can be reduced bysacrificing part of the heat exchange efficiency.