Fuel cell electrolyte reinforced membrane and manufacturing method therefor

The present invention relates to a fuel cell electrolyte reinforced membrane, a membrane-electrode assembly comprising the same and a fuel cell, and more specifically, to an invention that can realize a fuel cell material and a fuel cell. having improved performance by providing a fuel cell electrolyte reinforced membrane comprising, from the cross-sectional view of the electrolyte-reinforced membrane, a first electrolyte layer formed on a side surface of a porous support; and a second electrolyte layer formed on the other side surface. By introducing the porous support having improved mechanical properties by being manufactured under particular conditions such as stretching ratio and stretching speed, the mechanical properties of the electrolyte reinforced membrane can be greatly improved, and the difference in mechanical properties between a first axial direction (length direction) and a second axial direction (thickness direction) can be minimized.