The invention relates to a 
brazing repair method for failures of aeroengine 
cobalt-based 
superalloy parts. The method comprises the following steps: S1, 
polishing; S2, cleaning; S3, making positioning pieces positioned; S4, filling 
alloy powder: filling gaps among 
polishing zones by using the 
alloy powder which is minus 100 to 325 meshes and mixed with adhesives, wherein the materials of the 
alloy powder are the same as or similar to the materials of the 
cobalt-based 
superalloy parts, and the filling heights exceed 1-5mm of the surfaces of the 
cobalt-based 
superalloy parts; S5, filling solders; S6, 
drying; S7, carrying out vacuum 
brazing: firstly, rising temperature to 600 to 800 DEG C, carrying out heat preservation for 10-30min, then adjusting the temperature to 1100 to 1180 DEG C, carrying out heat preservation for 1-2h, performing 
brazing, cooling to the temperature of 800 to 900 DEG C along with a furnace, then filling 800 to 1500-mbar 
argon and cooling to the temperature of 50 to 100 DEG C, and discharging from the furnace; S8, 
machining profiles; S9, carrying out post-
welding inspection. The brazing 
repair method for the failures of the aeroengine cobalt-based superalloy parts disclosed by the invention has the advantages of solving the problems of incapability of repairing the parts by using the conventional 
fusion welding, having a good repairing effect and making the parts being capable of reused to reduce the cost.