The invention relates to the technical field of garment ironing, in particular to a garment ironing device capable of automatically discharging. The device comprises an operating platform. The device further comprises an erect support, a sliding beam, a sliding part, a lifting part and an ironing board, wherein the erect support is connected to the upper side of the operating platform through threads, the sliding beam is arranged on the upper portion of the erect support in a threaded connection mode, the sliding part is slidably arranged on the sliding beam in a sleeving mode, the lifting part is arranged on the lower side of the sliding part in a clamping connection mode, and the ironing board is rotatably connected with the lower end of the lifting part in a threaded mode.