The invention discloses a conveying device of a floor grooving machine. The conveying device comprises a supporting frame, a conveying belt located on the supporting frame and a driving motor used for driving the conveying belt. The driving motor is located below the supporting frame, the tail end of the supporting frame is connected to the input end of a grooving machine working table, the end, close to the grooving machine working table, of the supporting frame is sequentially provided with a drying box and a washing box from left to right, and the conveying belt is covered with the drying box and the washing box, so that floors enter the grooving machine working table after being sequentially conveyed to the washing box and the drying box through the conveying belt. According to the conveying device of the floor grooving machine, the position, close to the abutting joint end of the conveying supporting frame and the grooving machine working table, of the conveying supporting frame is sequentially provided with the washing box and the drying box, the floors are driven by the conveying belt to enter the washing box and the drying box sequentially to be washed, then the floors enter the grooving machine working table to be grooved, and therefore the grooving quality of the floors is improved.