▎ 摘　　要

NOVELTY - Preparing porous multilayer three-dimensional graphene comprises (i) adding sugar into alkaline earth metal carboxylate aqueous solution, and stirring for 6-72 hours to obtain beige dispersion, where sugar is sucrose or glucose, (ii) vacuum freeze-drying beige dispersion obtained in step (i) at -60 to -30 degrees C for 12-36 hours to obtain white mixture, (iii) heating white mixture obtained in step (ii) at 650-1000 degrees C at a rate of 3-20 degrees C/minute under argon atmosphere, maintaining constant temperature for 0.5-4 hours, and naturally cooling to obtain gray powder, and (iv) washing gray powder obtained in step (iii) with dilute acid for 2-3 times, then washing with water for 2-4 times, and drying at 40-100 degrees C to obtain porous multi-layered three-dimensional graphene. USE - The method is useful for preparing porous multilayer three-dimensional graphene. ADVANTAGE - The product has low cost; and method is environmentally friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for porous multilayer three-dimensional graphene is obtained by above method.