▎ 摘　　要

NOVELTY - Preparing a carbon-based core-shell structure pinecone-type nano-flower magnetic composite material, comprises (1) dissolving polyvinylpyrrolidone in water, dropping hydrochloric acid solution to adjust the pH of the solution to 2, adding potassium ferrocyanide, and placing in a reaction kettle to heat and react, and cooling to room temperature to obtain reaction solution, centrifuging, washing to obtain PB precursor powder after drying, and (2) heating the resulting PB precursor powder to 650℃ and reacting, obtaiing the γ-ferric oxide-N-r-graphene oxide/Multi-walled carbon nanotubes composite material, cooling to room temperature to obtain the carbon-based core-shell structure pinecone-shaped nanoflower magnetic composite material. USE - The method for preparing the pine-shaped nano-flower magnetic composite material and used in electromagnetic shielding and wave-absorbing material, rechargeable battery, chemical catalytic material, optoelectronic material and magnetic recording material. ADVANTAGE - The process is simple and easy, and the repeatability is good. The preparation condition is simple, it does not need to consider special atmosphere, pressure environment, and reducing the preparation cost.