The invention relates to a monolithic capacitive touch screen and a preparation method thereof. The monolithic capacitive touch screen comprises a monolithic substrate (1), a non-window printing ink area (2), a window touch area (3) and a lead area (4), wherein the non-window printing ink area (2) is arranged around on the monolithic substrate (1), and encloses the window touch area (3); the lead area (4) is arranged on the non-window printing ink area (2); and an electrode material of the window touch area (3) is a graphene transparent conductive thin film. According to the preparation method for the touch screen, tampered glass can be favorably manufactured, the strength maintenance capability and stability of the tempered glass are improved, and in addition, the light transmittance and impedance uniformity of a sensing electrode of the touch area can be remarkably improved; and a yellow light preparation process is eliminated, and only laser direct writing etching or a metal mask and reactive ion etching are adopted, so that a manufacturing process is convenient, quick and high in efficiency.