The invention discloses a reliability modeling method and a prediction method for the bonding strength of a steel bar and concrete at a high temperature. The reinforced concrete structure is widely applied to engineering construction, however, the mechanical properties of steel bars and concrete can be degraded due to high-temperature environments generated by fire disasters, explosions and the like, and then the safety of the structure is greatly reduced. According to the method, a Frechet distribution function (Frechet distron) is innovatively adopted to describe the distribution law of themeasured values of the bonding strength of the reinforcing steel bars and the concrete; the reliability modeling method and the prediction method for the bonding strength of the steel bar and the concrete at the high temperature are invented, and technical support is provided for damage evaluation and prediction of a bonding interface of the steel bar and the concrete at the high temperature.