A non-contact inspecting device for a panel, which has a plurality of signal inputting sensors, a plurality of signal detecting sensors and a control circuit. The signal inputting sensors are configured in a first detecting bar, and the signal detecting sensors are configured in a second detecting bar. When the device inspects the panel, the control circuit controls the signal input sensors of the first detecting bar to provide a detecting signal and controls the corresponding signal detecting sensors of the second detecting bar to receive the detecting signal synchronously, thereby relatively reducing tact-time.