The invention relates to a vacuum brazing repair method for cracks of aeroengine supersonic regulating plates. The method comprises the following steps: S1, polishing; S2, carrying out flaw detection; S3, cleaning; S4, filling alloy powder; S5, filling solders; S6, coating stop welding flux and drying; S7, carrying out vacuum brazing: firstly, performing vacuum pumping to be below 1.80*10<-2>Pa, then carrying out partial pressure of argon gas to be 50-100Pa, rising temperature to 600 to 650 DEG C, carrying out heat preservation for 10-15min, then performing vacuum pumping to be below 8.0*10<-2>Pa, rising temperature to 1150 to 1210 DEG C, carrying out heat preservation for 30-50min, performing brazing, cooling to the temperature of 800 to 900 DEG C along with a furnace, then filling argon and cooling to the temperature of 50 to 100 DEG C, and discharging from the furnace, and controlling the heating rates all at 5-10 DEG C/min in the whole temperature rising process; S8, restoring profiles. The vacuum brazing repair method for the cracks of the aeroengine supersonic regulating plates disclosed by the invention has the advantages that uniform heating can be carried out and welding cracks generated for large stress in the welding process are avoided, and the high-temperature strength of welded joints is measured to be up to 98% of the substrate strength after welding, so that the vacuum brazing repair method for the cracks of the aeroengine supersonic regulating plates can be widely applied to the repair for the cracks of the aeroengine supersonic regulating plates made of (B Zhe El 12y) nickel-base superalloy casting parts.