The interface performance between steel plate and concrete is the key to strengthened concrete structure. Firstly, a total of 27 specimens for steel plate bonded concrete under hydrothermal environment were carried out in this study. The accelerated hydrothermal aging was conducted in 5 days, 10 days and 15 days, respectively. Then, the double-shear test was performed to obtain the ultimate load, strain distribution and relationship of load-displacement during the shear failure process on steel plate-concrete interface. After long term temperature and humidity coupling, the durability of the steel plate-concrete interface was studied. Considering the analysis of bond failure mode, loading process and the relative displacement evolution on bonding interface, the expression of shear stress and slip was proposed, which was related to temperature and humidity. Finally, the bond-slip constitutive model was established in consideration of the temperature and humidity. The numerical simulation results were in good agreement with the experimental results.