In order to save a power source and keep induction sensitivity, the invention provides a touch detection device capable of saving the power source consumption of a touch panel, comprising a touch induction unit, a micro control unit and a mode detection unit, wherein the touch induction unit is coupled with the touch panel and used for generating an induction data according to a touch state of the touch panel through a first control signal trigger; the micro control unit is coupled with the touch induction unit and used for generating a first control signal through a second control signal trigger; and the mode detection unit is coupled with the micro control unit and the touch panel and used for generating a second control signal according to the touch state of the touch panel.