To provide a series of zero-emission type phytoremediation system technologies for treating the environments of contaminated areas near plants, making the effective use of the sites of plants, and reusing valuable metals.

After purifying contaminated soil by using a heavy metal absorbing plant (Phyolacca americana, a shepherd's purse, hogweed, a marigold, bridal veil, Athrium yokoscense, or the like), valuable metals are separated/recovered from the plant by using an environmental protection type engineering comprising steam blasting and extraction-and-separation operation, and the constituents of the plant, for example, cellulose, hemicellulose and lignin are used as recycling resources.