A　multicomponent　metallic　glass　(MG)　with　highly　efficient　and　anomalous　durability　for　catalyzing　water　splitting　is　reported.　The　outstanding　performance　of　the　MG　catalyst　contributed　by　self-optimized　active　sites　originates　from　the　intrinsic　chemical　heterogeneity　and　selective　dealloying　on　the　disordered　surface;　thus,　a　new　mechanism　for　improving　the　durability　of　catalysts　is　uncovered.