▎ 摘　　要

NOVELTY - A hydrogel material contains graphene oxide and polyamic acid. The hydrogel is obtained by crosslinking polyamic acid with graphene oxide. USE - Hydrogel material (claimed). ADVANTAGE - The hydrogel material is inexpensive, and has excellent efficiency and self-repairing function. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of hydrogel material, which involves dispersing graphene oxide in water and ultrasonically processing to obtain graphene oxide dispersion liquid, adding water-soluble polyamic acid to the graphene oxide dispersion liquid and stirring to obtain graphene oxide/polyamic acid solution, mixing graphene oxide/polyamic acid solution, drying and leaving.