Horizontal barrier material for risk management and control of polluted land parcel and preparation method

The invention provides a horizontal barrier material for risk management and control of a polluted land parcel and a preparation method, belonging to the technical field of risk management and controlof polluted land parcels. The material comprises modified natural short fibers, a powder material and a liquid material in a mass ratio of 1: 20: 17, wherein the modified natural short fibers are modified jute fibers or modified Arenga engleri fibers with length of 2-6 mm; the powder material comprises Portland cement, ground calcium carbonate and quartz powder; the liquid material comprises a polymer emulsion, a defoaming agent, a coalescing agent, a compatibilizer, a dispersing agent and deionized water. The preparation method comprises the following steps: pouring the liquid material intoa container, carrying out uniform mixing, and adding a mixture obtained by uniformly mixing the modified natural short fibers and the powder material; and carrying out stirring for 10-20 minutes to obtain slurry liquid without