The invention provides a circuit repairing method used for a
printed circuit board, comprising the following steps: firstly detecting a circuit on the
printed circuit board, marking a position of a defect on the circuit, comparing the defect with a
circuit design drawing, and obtaining coordinate values of the defect; then detecting a shape of the defect, designing and
carving a to-be-repaired region according to the shape of the defect, and
carving and removing a
copper foil in a
copper-rich region by using a
carving machine; and finally referring to the
circuit design drawing, determining aglue
extrusion path and a glue
extrusion technology according to the position and shape of the to-be-repaired region, extruding
slurry into the to-be-repaired region according to the glue
extrusion path and the glue extrusion technology, and solidifying the
slurry. The provided circuit repairing method used for the
printed circuit board has the advantages that the position and shape of the defectare detected, the
copper-rich region and a copper-deficient region are carved, a
short circuit defect is eliminated, then the to-be-repaired region is filled by using the
slurry, repairing on the defects such as circuit breakage and a pit is realized, and production yield of the printed circuit board is improved.