LAUSR

Currently, with the rapid development of electronic technology, electronic products are becoming increasingly used in both military and civilian fields. Technology is a double‐edged sword. While it brings convenience to people, it also brings risks. The use of electronic products brings electromagnetic radiation. Therefore, studying the absorption of electromagnetic waves by microwave absorption materials is of great research significance. At present, common carbon‐based microwave absorption materials include carbon fiber, graphene, carbon nanotubes, carbon black, etc. However, the complex preparation process and high cost limit its use. In contrast, biomass‐derived materials are receiving widespread attention due to their green and environmentally friendly characteristics as well as abundant carbon sources. This review highlights the preparation approaches of biomass‐derived carbon and systematically analyzes recent progress in composite biomass carbon‐based microwave absorption materials. These composite materials are typically prepared by combining biomass as a carbon source with magnetic materials, conductive polymers, and transition metal oxides. In the future, biomass materials will have good application scenarios in the field of electromagnetic absorption.