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The mix-faceted Cu2O nanoparticles with tunable {111} and {100} facet ratios were successfully prepared by a facile method. In this experiment, the as-synthesised Cu2O photocatalysts with different {111} and {100} facet ratios were more active than the sole {111} or {100} faceted Cu2O. The optimised Cu2O photocatalyst with 68% {100} facet displayed the highest visible light photocatalytic activity for hydrogen production, which was about 4.53 and 5.89 times as high as that of Cu2O nanoparticles with the single (100) and (111) facets. Besides, possible photogenerated electrons and holes transfer mechanism of the mix-faceted Cu2O was proposed in detail. [ABSTRACT FROM AUTHOR]