The invention discloses a method for improving resistance welding hole plugging oil seepage of a circuit board. The method is used for performing resistance welding hole plugging treatment on a hole to be plugged in the circuit board. The method comprises the following steps: pretreatment of resistance welding: performing board grinding treatment, cleaning the surface of the circuit board, and generating coarseness on the copper surface of the circuit board; plate drying treatment: performing plate drying pretreatment before the pretreatment of the resistance welding, and/or performing plate drying posttreatment after the pretreatment of the resistance welding; resistance welding hole plugging: performing hole plugging treatment on the hole to be plugged in the circuit board; printing resistance welding ink on the circuit board; performing alignment, exposure and development of the circuit board; performing final curing treatment of the circuit board. According to the method for improving the resistance welding hole plugging oil seepage of the circuit board, water retained in the hole in the circuit board and a base material can be removed; the defect of oil seepage after resistance welding hole plugging and curing are performed on the circuit board is effectively improved, the quality of a product is improved, and the operation flow is simpler and more convenient.