▎ 摘　　要

NOVELTY - The method involves performing pretreatment of raw materials by adding biomass fiber into benzene alcohol solution for extracting, filtering, collecting filter residue. Lignin is removed by performing water bath heating, filtering and repeating operation, collecting filter residue, cleaning to neutral to obtain a sample. Hemicellulose is removed by adding the sample into potassium hydroxide solution and carrying out water bath heating. Mechanical treatment is performed by adding distilled water to purified cellulose to performing ultrasonic treatment or high pressure homogenization treatment to the purified cellulose to obtain nano cellulose aqueous dispersion liquid. Freezing, drying and calcining are performed by freezing and drying the nano-cellulose aqueous dispersion liquid, heating and calcining under protection of inert gas and naturally cooling to room temperature to obtain a two-dimensional graphene-like carbon nanosheet. USE - Method for preparing two-dimensional graphene-like carbon nano-sheet. Uses include but are not limited to physical, chemical, material science, biological engineering, mechanics, optics, thermodynamics, electricity and catalysis fields. ADVANTAGE - The method enables to prepare two-dimensional graphene-like carbon nano sheet, which has high-temperature carbonization recombination, and removes wax in the biomass fiber, lipid, tannin and pigment.