The invention relates to preparation for an 
active carbon material, aiming at providing an efficient and safe preparation method for an 
active carbon material for adsorbing 
phosphorus in a 
water body. The method comprises the following steps of: naturally air-
drying thalia dealbata for 7 days, chopping, 
grinding into a 
powder, sieving, and then placing in an oven and 
drying for 3 hours; placing the dried 
powder in a 
carbonization furnace, performing high-temperature 
carbonization while charging 
nitrogen, heating to 500 DEG C, insulating heat for 2 hours, and then cooling to a 
room temperature; and performing high-temperature activation while charging 
carbon dioxide gas in the 
carbonization furnace, heating to 600 DEG C, insulating heat for 2 hours, and then cooling to a 
room temperature to obtain the product. Via the preparation method disclosed by the invention, the problem of 
plant waste treatment in 
water body purification is solved, the possibility that 
plant branches and leaves contaminate the 
water body after being withered is prevented, and waste is turned into wealth; and the prepared 
biomass active carbon is used for further purifying the water body, thus solving the problem of the possibility of secondary 
pollution in the water body which is purified by active carbon. The preparation method has the advantages of being high in treatment efficiency, economic and practical, green and environment-friendly, cyclic in purification and the like, as well as achieves the expected effect of efficient decontamination.