Considering the problem of parameter uncertainty existed in hypersonic vehicles, a double-power sliding mode controller based on backstepping control is designed. Firstly, the dynamics model of the hypersonic vehicle is translated to the strict feedback form, and the dynamic surface control method is adopted in backstepping design to avoid the problem of explosion of differentiation terms. Secondly, the sliding mode control method is integrated on the basis of the backstepping control, and double-power approaching law is used in the sliding mode control to eliminate the chattering. The stability of the method is proved by the Lyapunov stability principle. The simulation results show that the double-power sliding mode controller based on backstepping control can realize stable tracking of altitude and velocity in the presence of uncertain parameters.