The invention provides a GOA circuit and OLED display device. The GOA circuit comprises a plurality of cascaded GOA units, with each GOA unit comprising: a scan signal output module and an emitting signal output module electrically connected to the scan signal output module; during a frame period, the scan signal output module is capable of outputting a scanning signal including at least two low potential pulses within a frame time, and the light emitting signal output module can output a valid emitting signal according to the scan signal outputted by the scan signal output module. Thus, the GOA circuit for scan signal and the GOA circuit for emitting signal in the conventional design are integrated into a GOA circuit, which can reduce the number of TFTs and capacitors, simplify the circuit structure, and facilitate narrow-border display.