The present disclosure generally relates to the field of display technologies and, more particularly, to a touch circuit, a touch detection method, a display panel, and a display device. The touch circuit includes a touch electrode, a touch signal line, and a driving transistor. The driving transistor has a control terminal coupled to the touch electrode, a first terminal receiving a first power signal, and a second terminal coupled to the touch signal line, and is configured to output a current signal to the touch signal line based on a voltage signal of the touch electrode.