A scan GOA circuit, comprising: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, and a first capacitor. The first thin film transistor has a first end connected to an inverted clock signal and a second end connected to a first end of the second thin film transistor to serve as an output end. The third thin film transistor has a gate connected to a scan start signal, a first end connected to a gate of the second thin film transistor, and a second end connected to a second end of the second thin film transistor and a high voltage signal. A gate and source of the fourth thin film transistor are joined and connected to the scan start signal, and a drain thereof is connected to a gate of the first thin film transistor. The first capacitor is connected in parallel between the gate of the first thin film transistor and the second end of the first thin film transistor. The first end is a source and the second end is a drain, or the first end is a drain and the second end is a source. The GOA circuit ensures normal signal output operation of an output end.