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In this paper, a new reaching law control method based on extended state observer (ESO) is proposed for buck converter system with time-varying disturbances, such as output load fluctuation. Firstly, the time-varying disturbances in the system are modeled, and the problem of suppressing time-varying disturbances is transformed into the problem of suppressing matched and unmatched disturbances. Secondly, ESO is designed to estimate the matched and unmatched disturbances. Combining with ESO, a new exponential power reaching law sliding mode controller is also designed to suppress the influence of time-varying disturbances for the system effectively. Then, the convergence of observer and the stability of closed-loop control system are analyzed by Lyapunov stability theorem. Finally, the simulation results verify the effectiveness of the proposed method.