To improve visible-light-driven photocatalytic performance, sonochemical and freeze-drying processes were used to synthesize silver halide nanocrystals.AgCl nanocubes (~115 nm in edge length) with a small amount of metal Ag species were synthesized by a one-step sonochemical approach under ambient conditions, and the as-obtained Ag@AgCl hybrid photocatalysts showed excellent photocatalytic performance to degrade various dye molecules under visible light.