▎ 摘　　要

NOVELTY - A supercapacitor electrode material preparing method involves placing a three-dimensional graphene substrate as a working electrode, a reference electrode, and a counter electrode in an electrolyte containing a transition metal ion salt, employing a constant voltage deposition method and a constant current deposition method or cyclic voltammetry to deposit a transition metal oxide on a three-dimensional graphene substrate, and drying to obtain a supercapacitor electrode material, where the supercapacitor electrode material comprises a three-dimensional graphene substrate and a transition metal oxide deposited on the three-dimensional graphene substrate. USE - Method for preparing supercapacitor electrode material.