The aim of this paper is to summarize the research progress on the application of biochar in the remediation of heavy metals in tailings soil. Through combing and analyzing the related literature, this paper summarizes the preparation and influencing factors of biochar, its main properties, the effect of remediation of soil heavy metal pollution and the remediation mechanism, as well as the application of biochar in the remediation of heavy metals in tailings soil. The study shows that biochar has good adsorption and passivation of heavy metals, which can significantly reduce the content of heavy metals in the soil and thus improve the soil environment. However, there are certain shortcomings in the study, such as the aging, regeneration and economy of biochar need to be further investigated. Therefore, future studies should deeply investigate the optimal conditions, economic feasibility and technical application of biochar in soil heavy metal remediation, with a view to providing new ideas and methods for the remediation of heavy metal pollution in tailings soil.