Disclosed is a method for double-skin resistance welding of oil sump of vibration-damping clad plate in the welding art, which contains: locating the fuel outlet plane of oil sump of vibration-damping clad plate on the location seat of welder, and locating the fuel outlet double-screw bolt on the fuel outlet and aligning. The two upper-electrodes decreasing at the same time, the first upper-electrode pressed on the fuel releasing double-screw bolt, the second upper-electrode pressed on the outer ring of the fuel outlet of the oil sump and near the double-screw bolt, the energy storage capacitor one- time discharging by energy storage welding transformer after the two electrodes are compacted, the second upper-electrode being released after energisation, at the same time the three lower-electrodes of point welding lifting and contacting with the lower steel plate of the fuel outlet of the oil sump and being compacted, energizing by alternating resistance welding transformer to complete the welding of doubling plate, keeping forcing, the second upper-electrode and the three lower-electrodes of point welding being released at the same time, the welding is completed, and finally the sealing and strength connection of fuel releasing double-screw bolt and doubling vibration-damping clad plate is formed. The welding has a high output rate, the sealing of the joint is good and the strength high, and the damage to the intermediate insulating layer of the vibration-damping clad plate is small.