According to the structural characteristics of the mandrel friction brace，a hysteretic energy dissipation model for sliding frictional kinetic heat conversion is established. The influence of friction heat generation on the performance of the mandrel friction brace is studied. The influence laws of initial friction force，thickness of friction plate，specific heat capacity of friction mandrel and friction coefficient on the mechanical properties and temperature field of the mandrel friction brace are analyzed. The theoretical calculation formula of the frictional force growth value of the friction brace under the influence of frictional heat generation is given and verified by numerical analysis results. The results show that the temperature of the new friction brace increases continuously during the friction process，and the high temperature zone mainly concentrates on the friction contact surface between the friction core shaft and the friction plate. With the increase of the thickness of the friction plate，the initial friction force and the friction coefficient the frictional heat effect becomes more obvious. With the increase of the specific heat capacity of the material，the friction heat effect decreases. The research on the thermal effect of sliding friction of friction braces can provide the reference for the design of friction braces.