A structure for reinforcing a greening member and a construction method thereof are provided. The structure for reinforcing a greening member comprises a greening member adapted for being placed on a surface of an area to be greened, a positioning cover (2), a positioning member (3) and a rope (4). The positioning member is adapted to be inserted into the ground of the area to be greened. A positioning member is provided with a pivot portion (31). One end of the rope is fixedly connected to the pivot portion, and the other end is exposed out of the ground of the area to be greened and passes through the greening member to reach the positioning cover. The other end of the rope is fixed by the positioning cover.