The invention discloses a surfacing repair method for a dissimilar metal pipeline of a safety end of a voltage stabilizer in a nuclear power station. The surfacing repair method comprises the following steps: depositing a stainless steel cladding layer on the inner wall of a low-alloy steel pipe section; surfacing a buttering layer onto the end surfaces of the low-alloy steel pipe section and the stainless steel cladding layer; enabling the buttering layer and a transition connection pipe to form a U-shaped groove, and connecting the two parts in a welding manner to form a buttering weld; excavating out a stainless steel weld from a weld between the transition pipe section and the pipe section, carrying out repair welding on the stainless steel weld, and polishing a repair welding weld to enable the repair welding weld to be level with the pipe section; and surfacing a nickel-based alloy surfacing layer on the low-alloy steel pipe section, the buttering layer, the buttering weld and the pipe section. With the adoption of the method, the stress state of the surfacing layer is improved, the surfacing repair process is simplified, the field surfacing repair difficulty is lowered, and safe, reliable and efficient surfacing repair for a dissimilar metal joint of the safety end of the voltage stabilizer is realized.