The invention relates to a plant remediation technique for heavy metal contaminated soil and discloses the use of urticaceae plants in remediation of cadmium contaminated soil, in particular the use of Debregeasia orientalis C. J. Chen in remediation of cadmium heavy metal contaminated soil, which is to plant Debregeasia orientalis C. J. Chen in the heavy metal contaminated soil. Based on the cadmium enriching characteristic of Debregeasia orientalis C. J. Chen, the Debregeasia orientalis C. J. Chen is planted in the cadmium contaminated soil to absorb accumulated cadmium heavy metal and transfer most cadmium heavy metal to the parts above group, the parts above the group are harvested and ashed to extract heavy metal, and thus, the cadmium contaminated soil is remediated. In the growing process of the Debregeasia orientalis C. J. Chen, plant management is not required and stools can be left for growing braches, so the cost is low and the operability is high; meanwhile, new plant resource varieties are development for plant remediation of heavy metal contaminated soil, and new improvement and development space is provided for the deep development of the plant remediation technique.