The invention relates to a method and a device for manufacturing a vegetable fibre product by adopting a molding forming method. The method and the forming machine can effectively eliminate water drippage in a wet-green transfer mold, and the product has good quality and high production efficiency. The technical scheme is as follows: the method for eliminating water drippage of the mold of the molding forming method comprises the steps of blowing regularly back and forth above a filtering forming device by a blowing device after wet-green is formed and before the wet-green transfer mold sucks the wet green in the filtering forming mold, and blowing away a small amount of serous fluid and standing water in the non-filtering area. The molding forming machine comprises a stand, a control device, the filtering forming device, a left hot-press forming device, a right hot-press forming device and a multifunctional auxiliary device, wherein a member bar group of the device is provided with at least one wind spraying bar with a spout or/and an addition agent bar with a nozzle, and a power mechanism for driving the wind spraying bar or/and the addition agent bar to reciprocate back and forth above the filtering forming device.