The invention relates to a commercial refrigerator downspout structure capable of preventing water leakage. According to the technical scheme, the commercial refrigerator downspout structure capable of preventing water leakage comprises an inner container base plate, a rubber sealing ring and a downspout, wherein a base plate counter bore is manufactured in the position, where the downspout is installed, of the inner container base plate. The commercial refrigerator downspout structure capable of preventing water leakage is characterized in that a circle of vertical downward turnup is manufactured on the opening of the bottom plate counter bore; a first stage counter bore with the inner diameter adapting to the outer diameter of the turnup is formed in the upper portion of the downspout, a second stage counter bore provided with internal threads is formed in the middle of the downspout, and the diameter of the internal threads is slightly smaller than the inner diameter of the turnup; a smooth through hole is formed in the lower portion of the downspout, and the turnup is located in the first stage counter bore of the downspout; after the bottom plate counter bore is provided with a rubber sealing ring in a lining mode, a downspout cover is assembled, the downspout cover is bolt-shaped in appearance, the rubber sealing ring is pressed by a round cover plate at the upper portion of the downspout cover, external threads matched with the internal threads on the downspout are manufactured on the lower portion of the downspout cover, and an inner hexagon hole is formed along the central axis of the downspout cover. The commercial refrigerator downspout structure is applicable to a commercial refrigerator.