▎ 摘　　要

NOVELTY - The method involves adding nano-silica sol to a graphene ink. Dispersing process is performed to obtain graphene sol and ratio of graphene. Graphene hydrogel is placed in a freezing crucible mold for placing the mold into a freezing container. A liquid nitrogen is added into a container for quickly freezing a graphene hydrogel. A nano-scale graphene is placed on a surface of the graphene -scale surface for obtaining compression strength and nano covalent connection. Oxidation degree of an element in a carbon source is determiend. Carbon, hydrogen and oxygen ratio is adjusted. USE - Nano-covalent connected graphene preparing method used in aerospace, military, and electronic fields. ADVANTAGE - The method enables preparing nano-covalent connected graphene graphene so as to improve compression strength and nanometer covalent graphene and compressive stress. DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating a nano-covalent connected graphene preparing method. (Drawing includes non-English language text).