The invention belongs to the field of
environmental protection and discloses a soil heavy
metal repairing agent and a preparation method thereof. The soil heavy
metal repairing agent comprises a high molecular
polymer and a filler, wherein the high molecular
polymer can form a stable chelate compound with heavy
metal ions to effectively adsorb and fix free heavy metal ions in soil, reduce the activity of
heavy metals, stop
crop absorption and control the migration of the
heavy metals by virtue of adsorption of the filler. The preparation method of the soil heavy metal repairing agent disclosed by the invention is simple to operate and suitable for industrial production. A test result shows that the soil heavy metal repairing agent disclosed by the invention can reduce the activity of the
heavy metals in soil, improve the physical and chemical properties of the soil, reduce the acidity of the soil and improve the
soil fertility to promote the growth of rice, improve the yield of the rice and reduce the content of the heavy metals including
cadmium, lead and
arsenic in the rice so as to ensure that the content of the heavy metals including
cadmium, lead and
arsenic in the rice is less than a safe value of 0.2mg / kg.