The present invention relates to a self-adjusting photosensitive touch circuit, which includes a light-sensing component, a variable capacitor and a switch component. The light-sensing component is for sensing a touch status and receives a first control signal. The light-sensing component is enabled by a level of the first control signal. The variable capacitor is electrically coupled to the light-sensing component. A capacitance of the variable capacitor is altered along with a voltage difference between two terminals of the variable capacitor. The switch component is electrically coupled to the variable capacitor, and receives a second control signal. The switch component is enabled by a level of the second control signal. Therefore, a range of the gate voltage difference of the light-sensing component can be increased, so as to improve the sensitivity and accuracy of the light-sensing component. Moreover, the present invention also relates to a display device thereof.