Environmental protection agent for reducing leaching concentrations of a variety of heavy metals

The invention discloses an environmental protection agent for reducing the leaching concentrations of a variety of heavy metals, wherein the components of the formula of the environmental protection agent comprises 0.5-35 wt% of sodium silicate, 0.7-41 wt% of superphosphate, 0.3-40 wt% of ferrous sulfate, 1-33 wt% of sodium humate, 0-22 wt% of ethylenediaminetetraacetic acid, and 0-20 wt% of sodium hydroxide. According to the present invention, the environmental protection agent can be prepared on site according to the pollution type and the ution degree of the soil on site, and the disadvantage that the stabilized repair fixed agent composition is difficultly adapted to the change of the pollution type and the pollution degree can be avoided; with the application of the slurry agent in repair of heavy metal contaminated soil and groundwater, the reaction efficiency is high; and with the environmental protection agent, the leaching toxicities of heavy metals especially copper, lead, cadmium and arsenic in the