The invention discloses a modular cultivation method for heavy metal hyper-accumulating plants. The method comprises the steps of module box preparation, seedling raising preparation, seedling raising, transplanting, management after transplanting, harvesting and the like. According to the method, the plants are cultivated in a modular mode, controllable regulation is achieved, not only is the planting density evener, but also the labor costs are greatly reduced in industrialized and modular conveying and other operation from seedling raising to transplanting, the growth of the plants is continuous and good, the quantity of absorbed heavy metals is relatively high, the capability is relatively high, and in particular, the root-layer grass-free comprehensive effect is very obvious.