Disclosed are an ultra-thin touch panel and a method of fabricating the same. Particularly, the ultra-thin touch panel according to an embodiment of the present disclosure includes a flexible substrate, a plurality of first sensing electrodes arranged in a first direction on the flexible substrate, an adhesive insulating layer formed on the flexible substrate and the first sensing electrodes, and a plurality of second sensing electrodes arranged in a second direction, which intersects the first direction, on the flexible substrate and the adhesive insulating layer using a wet transfer method, wherein the flexible substrate is patterned in a shape corresponding to the first and second sensing electrodes by oxygen plasma etching to form a polygonal mesh structure.