Horizontal directional drilling reamer bit with large deslagging structure

The utility model discloses a horizontal directional drilling reaming bit with a large deslagging structure, which comprises a bit body, a plurality of cutting units are arranged on the bit body, allthe cutting units are circumferentially and uniformly distributed by taking the central axis of the bit body as the center, and a deslagging groove is formed between every two adjacent cutting units.The center axis of the slag discharging groove is parallel to the center axis of the drill bit body, the two ends of the slag discharging groove are communicated to the front end and the rear end of the drill bit body respectively, the upper ends of the two side walls of the slag discharging groove are attached to the side walls, close to the slag discharging groove, of the cutting units respectively. The side, away from the drill bit body, of the cutting unit is the upper side, and the slag discharging groove is located below all cutting structures on the cutting unit. The slag discharging groove is additionally forme