A method of fabricating a high density printed circuit board by applying a strippable adhesive layer on a reinforced substrate (rigid substrate or carrier film) used as a base substrate, forming a metal foil on the adhesive layer by means of plating, lamination or sputtering, and forming a high density circuit on the metal foil serving as a seed layer by means of pattern plating. Specifically, the method of the current invention includes the steps of attaching adhesive means to one surface of a reinforced substrate (rigid substrate or carrier film), forming a seed layer on the adhesive means and forming a circuit pattern on the seed layer, laminating an insulating layer on the circuit pattern and removing the reinforced substrate (rigid substrate or carrier film), and removing the seed layer.