Capacitive touch screen

The invention relates to a touch screen, in particular to a capacitive touch screen. The invention discloses the capacitive touch screen. A touch signal return electrode is arranged on the capacitive touch screen or an application product with the capacitive touch screen; a touch detection electrode and a touch return electrode which are used for detecting the change of a touch signal are connected with different output ends of a touch excitation source respectively; the touch excitation source, the touch detection electrode, the touch return electrode and a coupling capacitor between the touch detection circuit and the touch return electrode form a closed touch loop; the touch signal flowing from the touch excitation source into the touch detection electrode flows back to the touch excitation source from the touch return electrode; a touch system is isolated from other systems so as to prevent signal crosstalk among different systems and enable the touch signal to flow in the closed system; and moreover, the touch information is obtained by detecting the touch signal current with specific frequency or other specific characteristics so as to prevent interference of other signals or other environmental substances on the touch detection.