Outdoor plant wall structure and sponge city plant green wall system

The utility model discloses an outdoor plant wall structure and a sponge city plant green wall system, comprising a fixing part, one side of which is connected with a preset placing surface; the greening part is connected with one surface, far away from the preset placement surface, of the fixing part; the water circulation part comprises a water storage tank, a water storage vertical pipe, a water storage tank, a water spraying vertical pipe and at least one spraying piece, the water storage vertical pipe is communicated with one end of the water storage tank, and the water storage tank is communicated with the water storage vertical pipe. Vegetation of the greening part is fixed to the outer wall of a building, the outer wall of an enclosing wall and the like through the fixing part, sothat on the premise that the land utilization rate is reduced, the greening area is greatly increased, and the environment is beautified; and through the arrangement of the water circulation part, redundant rainwater during r