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We theoretically find a new quantum state of matter--valley-polarized quantum anomalous Hall effect in silicene.In the presence of Rashba spin-orbit coupling and exchange field, silicene hosts a quantum anomalous Hall state with Chern number $mathcal{C}=2$.We show that through tuning Rashba spin-orbit coupling, a topological phase transition results in a valley-polarized quantum anomalous Hall state, i.e.a quantum state which exhibits electronic properties of both quantum valley-Hall effect (valley Chern number $mathcal{C}_v=3$) and quantum anomalous Hall effect with $mathcal{C}=-1$.This finding provides a platform of designing dissipationless valleytronics in a more robust manner.[1]