Abstract: The present method of manufacturing an abdominal belt is characterized by comprising the stage of manufacturing and preparation (S101) for manufacturing mould and preparing material, arranging stage of material in lower mould produced in the above stage of manufacturing and preparation (S102), binding stage of lower outside skin, lower inside skin, upper inside skin, upper outside skin together by putting the above lower mould into large welding device of high frequency and descending upper mould then heating material by the heating part of high frequency of upper mould (S103), separating stage of mutually adhered unfinished product from lower mould (S104), binding stage of unadhered part in separated unfinished product using a small welding device of high frequency (S105), attaching stage of velcro tape to the above unfinished product (S106), the stage of performing finishing work (S107), and attaching stage of enforcement band to the above product (S108).