Abstract: Waste plastics have been accumulated in rivers, lakes and seas. The micro/nano plastics generated by aging and decomposition pollute the water quality seriously and threaten the ecological environment and the safety of drinking water for residents. Traditional treatment methods including physical flocculation and biodegradation, still have problems such as long treatment period and low adsorption efficiency. Natural biomass contains large numbers of active hydroxyl and carboxyl groups. Physical treatment or chemical modification of biomass can be conducted to improve the pore structure and increase the specific surface area, and can be used as a green material for adsorbing micro/nano plastics. This work starts with the conventional treatment methods and the basic characteristics of micro/nano plastics, and briefly summarizes the potential effects and harm of different types of micro/nano plastics on plants, animals and human beings. Then research status of biomass materials (biochar, cellulose, chitin, etc.) in the field of the adsorption of micro/nano plastics is systematically introduced and the adsorption behavior, law and action mechanism of biomass materials on micro/nano plastics are analyzed and summarized. Finally, the future development prospects of the adsorption of micro/nano plastics by biomass materials are prospected.