The utility model discloses a light -duty roof greening embellishs formula planting device, including the device body, the device body has plants the layer by hold drainage blanket, filter layer, matrix layer and the plant that set gradually on going, and the device body is including the boss upwards raised with by protruding edge of table domatic to the roof transition. The utility model discloses a boss is planted the layer with the plant and is raised, makes light -duty roof greening local outstanding, breaks monotonic afforestation pattern. And with the domatic buffer of low -angle and the discrepancy in elevation between the horizontal plane on every side, the lofty discrepancy in elevation of avoiding, the device and on every side between the horizontal plane excessively naturally. The device raises planting face in the lawn layer that planted on ground, plants roof greening plant not of the same race on the planting face of raising, and it is abundant to make the roof greening pattern change to reach that to improve traditional lawn formula roof greening pattern single, the purpose of interspersing monotonic light -duty roof greening pattern. In addition, this device adopts the lightweight material preparation, and intensity is big, light in weight, convenient transportation and installation.