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Efficient hydrogen production via photocatalysis with high utilization efficiency of Pt cocatalyst is of great importance for sustainable development.In this work,we report an in situ auto-reduction strategy to encapsulate highly dispersed Pt clusters inside the cages of MIL-125-NH2.The amino groups in MIL-125-NH2 first react with formaldehyde to form reducing groups (i.e.,-NH-CH2OH),which can in situ auto-reduce the confined Pt2+ ions to ultrasmall Pt clusters within the cavities.With optimized Pt content,photocatalytic H2 production over the obtained Pt(1.5)/MIL-125-NH-CH2OH catalyst with 1.43 wt.％ Pt loading achieved as high as 4,496.4 μmol·g-1·h-1 under visible light (λ ＞ 420 nm) due to the facilitated transfer and separation of the photo-induced charger carriers arising from the synergetic effects between highly dispersed Pt clusters and MIL-125-NH-CH2OH framework.This in situ auto-reduction strategy may be extended to encapsulate various kinds of metal or alloy clusters/nanoparticles within amino-functioned metal-organic frameworks (MOFs) with superior properties and excellent performance.