Disclosed herein is a method of manufacturing a block module including: mounting an electronic part on a base substrate on which a ground terminal is formed; forming a lead frame to extend to the outside of the base substrate from the ground terminal; connecting a flexible printed circuit to a circuit layer on the base substrate; forming a mold to surround the base substrate; cutting the lead frame and exposing the cut surface of the lead frame to the outside of the mold; and forming a metal coating layer connected to the lead frame on the mold, whereby the metal coating layer is formed to surround the mold to interrupt the electromagnetic waves and the metal coating layer is connected to the ground terminal by the lead frame to make the process simple.