The invention discloses a conductive epoxy resin for pipeline repair and a pipeline online repair method. Specifically, two slidable sealing clamps in close contact with the pipeline inner wall are utilized to seal the repairing conductive epoxy resin containing sacrificial anode material powder particles between the clamps, gas pushes the clamps to move forward, and the filler between the clamps is extruded to fill pipe wall corrosion pits and quickly bond and solidify to the pipeline. The sacrificial anode material is employed to perform anode protection on the corrosion parts inside the pipeline, thus avoiding further corrosion of pipeline corrosion defect positions and ensuring the mechanical strength of the pipeline.