A method for manufacturing an integral shoe embryo, comprising: an interweaving step: weaving an initial shoe edge by knitting at least two yarns (20 and 21) in an interwoven manner; a shoe upper weaving step: weaving a first shoe upper connected to the initial shoe edge by knitting at least two yarns (20 and 21) along a first direction, performing weaving in a reverse direction when a shoe upper stitch count is reached to weave a second shoe upper that faces the first shoe upper by knitting the two yarns (20 and 21) along a second direction opposite to the first direction, and weaving the first shoe upper in a reverse direction according to the shoe upper stitch count, hence cyclically weaving the first shoe upper along the first direction and the second shoe upper along the second direction; a reinforcement piece weaving step: weaving a reinforcement piece by knitting at least one of the yarns (20 and 21) when the shoe upper stitch count is reached in the shoe upper weaving step, performing weaving in a reverse direction when an extension stitch count is reached while weaving the reinforcement piece, and weaving the first shoe upper and the second shoe upper by knitting the at least two yarns (20 and 21) according to the shoe upper stitch count when the extension stitch count is again reached, hence cyclically weaving the reinforcement piece, the first shoe upper and the second shoe upper, so that the reinforcement piece extends from where the first shoe upper and the second shoe upper are connected; a continual shoe upper weaving step: cyclically weaving the first shoe upper and the second shoe upper by knitting the two yarns (20 and 21), and forming a shoe opening; and a side overturning step: folding the first shoe upper and the second shoe upper from the shoe opening to locate the reinforcement piece in an in-shoe space defined by the overturned first shoe upper and second shoe upper to complete the shoe embryo. an interweaving step: weaving an initial shoe edge by knitting at least two yarns (20 and 21) in an interwoven manner; a shoe upper weaving step: weaving a first shoe upper connected to the initial shoe edge by knitting at least two yarns (20 and 21) along a first direction, performing weaving in a reverse direction when a shoe upper stitch count is reached to weave a second shoe upper that faces the first shoe upper by knitting the two yarns (20 and 21) along a second direction opposite to the first direction, and weaving the first shoe upper in a reverse direction according to the shoe upper stitch count, hence cyclically weaving the first shoe upper along the first direction and the second shoe upper along the second direction; a reinforcement piece weaving step: weaving a reinforcement piece by knitting at least one of the yarns (20 and 21) when the shoe upper stitch count is reached in the shoe upper weaving step, performing weaving in a reverse direction when an extension stitch count is reached while weaving the reinforcement piece, and weaving the first shoe upper and the second shoe upper by knitting the at least two yarns (20 and 21) according to the shoe upper stitch count when the extension stitch count is again reached, hence cyclically weaving the reinforcement piece, the first shoe upper and the second shoe upper, so that the reinforcement piece extends from where the first shoe upper and the second shoe upper are connected; a continual shoe upper weaving step: cyclically weaving the first shoe upper and the second shoe upper by knitting the two yarns (20 and 21), and forming a shoe opening; and a side overturning step: folding the first shoe upper and the second shoe upper from the shoe opening to locate the reinforcement piece in an in-shoe space defined by the overturned first shoe upper and second shoe upper to complete the shoe embryo.