Drainage device for catalpa bungei planting

The utility model relates to the technical field of drainage mechanisms, and discloses a drainage device for catalpa bungei planting, which comprises a soil layer and catalpa bungei seedlings positioned on the top of the soil layer, and the bottoms of the catalpa bungei seedlings are buried in the soil layer through a root hair clay layer. Rainwater can permeate into the soil layer to be absorbed by the root hair clay layer after falling on the soil layer, the water-absorbing cotton swabs make contact with the root hair clay layer in an inserted connection mode, at the moment, water sources continuously soaking and making contact with the root hair clay layer sink to the bottom to make contact with the water-absorbing cotton swabs when being too much, and when the water-absorbing cotton swabs are too full, the water-absorbing cotton swabs sink to the bottom to make contact with the water-absorbing cotton swabs. The water source adsorbed by the water absorption cotton swab can gradually flow into the embedded