The invention provides a structure for modular slope greening. The structure comprises a flexible grid frame and a container seedling, wherein the flexible grid frame is laid on a slope, and the container seedling is embedded in the flexible grid frame; the flexible grid frame is a three-dimensional mesh grid frame structure formed by welding high-density polyethylene (HDPE) sheets, the containerseedling is a seedling with a container, and the container seedling comprises a container having a substrate in which the seedling is planted. The invention also provides a method for modular slope greening. The method comprises the following steps: container seedling preparation, slope surface cleaning, slope top treatment, flexible grid frame fixing on the slope surface, embedding of the container seedling, maintenance management and the like. The structure and method for modular slope greening provided by the invention overcome deficiencies of the prior art, can quickly re-green the slope,and achieve the effect of rapidly controlling the slope. The plant survival difference is small and plants have high ornamental value. Moreover, the structure has good stability, is not susceptible toweather, and is suitable for wide-ranging promotion.