The invention discloses method and device for quick and reliable detecting defects of connection and broken line on Al membrane electrode produced from procedure. Combining positive negative mask slices, using comparison of transmittance of out going light intensity from detect, the method validates, positions, and saves information of detect, and transfers the information to laser repairing device by using control system. The invention also discloses method of sintering together between dielectric layer in subsequent preparation and repaired point after preburning in order to solve issue that after defects of broken line being repaired, the line is broken again through high temperature processing so as to repair defects of broken line on Al membrane electrode effectively.