In order to provide a comprehensive overview of research progress in the use of biomass ash as concrete admixture，the physical and chemical properties，mechanism of action，factors affecting the production process of biomass ash，and the effects of biomass ash incorporation on the working properties，mechanical properties，and durability of concrete were studied.The results show that biomass ash has a smaller density and a larger specific surface area than traditional mineral admixture，and the total amount of active components，namely SiO2 + Al2O3 + Fe2O3 （SAF） in most biomass ashes exceeds the requirements of class F volcanic ash （≥70%）.Incorporating biomass ash can effectively improve the mechanical properties and durability of concrete，but it may have a negative impact on the flowability and anti-carbonization performance of concrete.Moreover，the performance of biomass ash is greatly influenced by production processes such as combustion and grinding.To make biomass ash widely used in large-scale engineering in the future，it is necessary to optimize the production process of biomass ash.