Concealed lower drainage structure of sliding door

The utility model relates to the technical field of sliding doors, in particular to a hidden type lower drainage structure of a sliding door, which comprises a water collecting tank and two frames, sliding door sliding rails are arranged at the upper ends of the two frames, the water collecting tank is mounted between the sliding door sliding rails on two sides and is of a U-shaped structure, and the sliding door sliding rails are arranged between the two frames at the lower end of the water collecting tank. A frame body cavity is arranged below the sliding door sliding rail through sealing, clamping and supporting of a supporting piece, a plurality of water collecting groove lower drainage holes are formed in the bottom of the water collecting groove and the edge, close to the sliding door sliding rail on the outer side, of the water collecting groove, a plurality of frame body cavity water inlet holes are formed in the side edge, close to the water collecting groove, of the frame body cavity, and a pluralit