The invention discloses a method for manufacturing a cable branch joint, belonging to the field of electrical engineering. The production method comprises the steps of stripping end parts of a main cable and a branch cable to be connected, sleeving an inner layer heat shrinkable tube, a copper woven net sleeve and an outer layer heat shrinkable tube in the main cable, using a copper tube to connect a wire core of the main cable and a wire core of the branch cable, orderly winding an insulation self-adhesive tape, a Teflon film, a cable filling tape and a sealing tape on the copper tube, moving the inner layer heat shrinkable tube, heating the inner layer heat shrinkable tube such that the inner layer heat shrinkable tube shrinks, moving the copper woven net sleeve, fastening the copper woven net sleeve, moving the outer layer heat shrinkable tube, and heating the outer layer heat shrinkable tube such that the outer layer heat shrinkable tube shrinks. Thus the connection part of the main cable and the branch cable is protected, the security is improved further, the manufacture is convenient, the size of the branch joint is small, the installation is convenient, the security is high, and the method is especially suitable for manufacturing branch joints of 1KV to 10KV high voltage cables.