The invention relates to a method and a device for improving permeability and homogeneity of resin and reducing pores of a prepreg tape. The method comprises the steps of firstly rolling for attaching resin adhesive films to the prepreg tape integrated by fiber bundles by a hot pressing roller so as to allow resin to permeate into the prepreg tape preliminarily; and then assisting in pressing through supersonic vibration by a supersonic vibration compressing device so as to obtain the prepreg tape with good permeability and homogeneity of resin and few pores. The device comprises a bundle integrating device for integrating fiber bundles into the prepreg tape, resin adhesive film rolls are arranged at two sides of the bundle integrating device, and the hot pressing roller for rolling for attaching the resin adhesive films at the upper side and the lower side of the prepreg tape to the prepreg tape, the supersonic vibration compressing device for assisting in pressing the rolled attached prepreg tape through supersonic vibration, and a winding device for winding the prepreg tape pressed by supersonic vibration are sequentially arranged in the outlet direction of the bundle integrating device. The method can effectively improve the permeability and the distribution homogeneity of resin in the prepreg tape and overcome the defect of pores in the prepreg tape so as to greatly improve the quality of the prepreg tape.