Fuente: WIPO "circular economy" The invention provides a preparation method of a soil heavy metal adsorbent based on a green circular economy idea, which comprises the following steps: (1) under an inert condition, hydrolyzing animal residues, malic acid and water under high temperature and high pressure while stirring to obtain a hydrolysate; (2) the hydrolysate is cooled and filtered, hydrolysate and solid residues are obtained, the solid residue content of the hydrolysate does not exceed 5% by weight, and the hydrolysate is the soil heavy metal adsorbent based on the green circular economy concept. The invention further provides a soil heavy metal adsorbent based on the green circular economy concept. The preparation method of the soil heavy metal adsorbent based on the green circular economy concept is ingenious in design, simple in process, easy in raw material obtaining and low in production cost, and the prepared soil heavy metal adsorbent based on the green circular economy concept can be prepared from animal residues and can effectively adsorb various heavy metals in soil.