Abstract: A shoe upper mounting machine with a string lasting means is designed for mounting a shoe upper using a string lasting means for the footwear mounting sector with high-productivity, using the string lasting method of sewing the edges with a lasting string. The invention includes the use of this technology in footwear models which are normally excluded because they have sturdy, not flexible shoe uppers which are difficult to conform using string lasting. It is sufficient to provide a shoe upper with new dimensions suitable for this mounting technology. The machine is capable of lasting any string and adjusting any shoe upper to the form, provided these materials conform with acceptable quality standards for footwear components. The invention is characterized by a module (3) for fitting shoe uppers onto the form (F), a string lasting module (4), and optionally a module (5) for coupling and uncoupling the couplable footwear form.