Abstract: Objective The paper systematically evaluates AG102 and AG103 brazing filler metals and the comprehensive performance of their brazing of squirrel cage motor rotor end ring and guide bar joints. The aim is to analyze the mechanism of joint cracking failure when AG102 brazing filler metal are used, and to provide scientific references for the selection of brazing filler metals. Methods On the one hand, the microstructure, wettability and mechanical property of the brazing filler metals are compared and analyzed, and on the other hand, the tensile strength, impact property and fatigue property of the brazed joints of motor rotor end rings and guide bars are investigated by accelerated tests. Results Sn element content of AG102 brazing filler metal body is higher, the finished state AG102 in addition to α-Cu solid solution, α-Ag solid solution, but also contains distributed in the dark copper solid solution dotted and long striated of ζAgSn brittle phases, which is the main reason for the reduction of the strength of AG102 than AG103. With the prolongation of aging time, the brazing region of both brazing filler metals are found to be distributed in the dark grey copper phase with dotted AgSn and striated Cu5Zn8 compounds, and striated Cu5.6Sn compounds is distributed in the light grey Ag phase, in which more brittle compounds such as AgSn and Cu5.6Sn are precipitated in the brazing seam of AG102, resulting in a more obvious decrease in brazing strength of AG102. The impact property and fatigue property of AG102 are weaker than AG103. The presence of brittle compounds is found to deteriorate the brazing seam properties in the fracture analysis. Conclusion AG103 brazing filler metal with low Sn element content can increase the reliability of brazing seam and prevent the brazed ioints cracking of squirrel cage motor rotor end ring and guide bar.