Since the heat generated by energy dissipation, the ambient temperature and the heat generated by the energized coil will make the magnetorheological damper work in a wide range of temperature, the temperature has a great influence on the output damping force of the magnetorheological damper. Therefore, it is necessary to study the effect of temperature on the output characteristics of the magnetorheological damper and to establish a mechanical model of the magnetorheological damper considering the temperature effect. Based on the nonlinear hysteresis double viscosity model, the study uses a genetic algorithm and a nonlinear least squares method for curve fitting and parameter identification, and constructs a mechanical model that can be applied in a large temperature range. The results show that the proposed temperature-corrected model can more accurately restore the mechanical properties of magnetorheological dampers. By applying the temperature-corrected model to the simulation of the whole vehicle suspension system, the root-mean-square (RMS) values of the spring-loaded mass acceleration of the corrected and uncorrected models are reduced by 25.92% and 17.67%, respectively, compared with that of the passive suspension under the excitation of Class B road surface.