In this paper, an novel unified sliding mode (SM) control scheme is proposed for boost converters, which can be adopted for the controller design based on the quantitative dynamic and static performance indexes simultaneously. Due to the ON/OFF operations of power switch, the boost converter is modeled into a switching affine system. The steady-state error is the concerned static performance indexes, while overshoot and setting time are considered at the same time for the dynamics control. In order to satisfy the different control objectives at different phases of system movement, a SM control scheme with two hierarchical sub-controllers is proposed. If the steady-state error is chosen to construct a quadratic performance index function, a linear SM sub-controller is only needed; while if the dynamic performance indexes are needed for consideration, another extra Backstepping SM sub-controller will be added. Simulations verify the correctness of this paper.