A device for repairing photovoltaic cell string, characterized by comprising: a conveying device configured to drive a photovoltaic cell string placed on the conveying device to reciprocate along a first direction, wherein the conveying device comprises a first conveying component, a second conveying component and a third conveying component that are separately arranged; and a baking device arranged toward the second conveying component, wherein the photovoltaic cell string comprises a plurality of solar cells, adjacent solar cells of the plurality of solar cells are connected by a solder strip, the plurality of solar cells comprise a first solar cell, a second solar cell and a defective solar cell between the first solar cell and the second solar cell, a back side of the first solar cell is attached to a protruding solder strip of a first solder strip, the other part of the first solder strip is attached to a front side of the defective solar cell, a back side of the defective solar cell is attached to a protruding solder strip of a second solder strip, and the other part of the second solder strip is attached to a front side of the second solar cell, wherein the conveying device moves the first solar cell onto the second conveying component, the baking device heats the first solar cell and the protruding solder strip of the first solder strip so as to separate the first solar cell and the defective solar cell, the conveying device moves the defective solar cell onto the second conveying component, the baking device heats the defective solar cell and the protruding solder strip of the second solder strip so as to separate the defective solar cell and the second solar cell, the conveying device moves the first solar cell onto the second conveying component, the baking device heats the first solar cell and a protruding solder strip of another solder strip, the other part of the another solder strip being attached to a front side of an replacement solar cell, so that the first solar cell is connected to the replacement solar cell, the conveying device moves the replacement solar cell onto the second conveying component, the baking device heats the replacement solar cell and the protruding solder strip of the second solder strip, so that the replacement solar cell is connected to the second solar cell. a conveying device configured to drive a photovoltaic cell string placed on the conveying device to reciprocate along a first direction, wherein the conveying device comprises a first conveying component, a second conveying component and a third conveying component that are separately arranged; and a baking device arranged toward the second conveying component, wherein the photovoltaic cell string comprises a plurality of solar cells, adjacent solar cells of the plurality of solar cells are connected by a solder strip, the plurality of solar cells comprise a first solar cell, a second solar cell and a defective solar cell between the first solar cell and the second solar cell, a back side of the first solar cell is attached to a protruding solder strip of a first solder strip, the other part of the first solder strip is attached to a front side of the defective solar cell, a back side of the defective solar cell is attached to a protruding solder strip of a second solder strip, and the other part of the second solder strip is attached to a front side of the second solar cell, wherein the conveying device moves the first solar cell onto the second conveying component, the baking device heats the first solar cell and the protruding solder strip of the first solder strip so as to separate the first solar cell and the defective solar cell, the conveying device moves the defective solar cell onto the second conveying component, the baking device heats the defective solar cell and the protruding solder strip of the second solder strip so as to separate the defective solar cell and the second solar cell, the conveying device moves the first solar cell onto the second conveying component, the baking device heats the first solar cell and a protruding solder strip of another solder strip, the other part of the another solder strip being attached to a front side of an replacement solar cell, so that the first solar cell is connected to the replacement solar cell, the conveying device moves the replacement solar cell onto the second conveying component, the baking device heats the replacement solar cell and the protruding solder strip of the second solder strip, so that the replacement solar cell is connected to the second solar cell.