The invention relates to a forming device for production of a high-insulativity light-weight composite material beam. The forming device for production of the high-insulativity light-weight compositematerial beam comprises a forming device box body, wherein a forming device conveying mechanism, a forming device glue storage chamber and a forming mold are sequentially arranged inside the forming device box body from left to right; and forming device connecting plates are arranged on a front inner wall and a rear inner wall of the forming device glue storage chamber, forming device guide platesare arranged on the inner side faces of the forming device connecting plates, forming device supporting frames are arranged under the two forming device guide plates, forming device V-shaped groovesare formed in the top surfaces of the forming device supporting frames, a plurality of cloth guide rollers are arranged on two inclined side surfaces of the forming device V-shaped grooves, a glue injection device is arranged above the forming device box body, and the glue injection device is in sliding connection with the forming device box body. According to the forming device for production ofthe high-insulativity light-weight composite material beam has the advantages of being high in production efficiency and low in production cost, and the produced composite material beam has the advantages of being convenient to install, high in safety coefficient and long in service life.