▎ 摘　　要

NOVELTY - Double-layer core-shell structure palladium catalyst comprising core and shell layer, where core body comprises silicon dioxide micro-sphere. The shell orderly comprises titanium dioxide layer and graphene layer. The graphene oxide is loaded with palladium. USE - Double-layer core-shell structure palladium catalyst used for water catalytic decomposition (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing double-layer core-shell structure palladium catalyst, which involves: (A) adjusting pH value of silicon dioxide microsphere dispersion which is adjusted to alkaline to obtain alkaline nucleus dispersion; (B) adding graphene oxide water dispersion, coating reaction to obtain double-structure carrier into basic nucleus dispersion; (C) adding organic titanium source solution and reacting hydrolysis to obtain single-layer core-shell structure carrier; (D) dispersing single-layer core-shell structure carrier in aqueous dispersion; and (E) immersing double-layer core-shell structure carrier in palladium saltwater solution and loading palladium to obtain double-layer core-shell structure palladium catalyst.