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Biochar is a carbonaceous material produced by the pyrolysis of biomass, which has a porous structure and a high specific surface area. In recent years, with a focus on environmental protection and sustainable development, biochar, a new type of environmentally friendly material, has received extensive attention and research. In geotechnical engineering, biochar can be used in soil improvement, contaminated soil treatment, and other fields but also in slope protection, landfill engineering, and other aspects. This review aims to look back at the current research status of biochar application in geotechnical engineering and look forward to future development.