The invention relates to a glue supplying device of an automatic edge banding machine, comprising a molten glue pond (5), a glue supplying box (6), a glue coating shaft (7), a glue coating box (8), a gear case (10) and a bearing box (1); the glue supplying box (6) is installed in the molten glue pond (5), the lower end of the glue supplying box (6) is provided with a glue inlet (13) for communication with the molten glue pond (5), the upper end of the glue supplying box (6) is connected with the glue coating box (8), the upper end of the glue coating box (8) is connected with the gear case (10), and the bearing box (1) is installed at the bottom of the molten glue pond (5); the glue coating shaft (7) passes through the insides of the glue coating box (8) and the glue supplying box (6), the upper end of the glue coating shaft (7) is pivoted to the gear case (10), and the lower end of the glue coating shaft (7) is pivoted to the bearing box (1); the glue coating shaft (7) is in close fit with the inner wall of the glue supplying box (6), a spiral groove is arranged at the lower section of the glue coating shaft (7), and an excircle knurl is arranged at the upper section of the glue coating shaft (7). The glue supplying device has high glue supplying speed and large glue supplying height, is beneficial to edge banding for thicker plates and overcomes the adverse defects of the descending of a molten glue liquid level; the glue coating shaft is stable in rotation and has long service life; and the molten glue is not easy to leak.