The invention discloses an ecological parking garage which comprises at least one parking garage body and at least one plant box. The number of the parking garage bodies is equal to that of the plant boxes. Each parking garage body is fixed to a cement floor through connecting boards and expansion bolts. Each plant box is fixed to the top end of the corresponding parking garage body through the connecting boards and connected and fixed to uprights of the parking garage body. Each plant box is further provided with a water discharging device and a water feeding device and used for planting of flowers, grass, trees and the like. A certain angle is formed between each plant box and the corresponding parking garage body and each plant box inclines towards the tail portion of the corresponding parking garage body, so that moderate moisture is kept in the plant box under the action of a water discharging system and a water feeding system. According to the ecological parking garage, the construction cost is effectively saved, the construction difficulty is reduced, the greening area is effective increased under the condition that the number of the garage bodies is not changed, and the greening effect is effectively improved.