The invention provides a luminescence control circuit which is taken as a shift register unit circuit. The circuit comprises a first clock signal input end, a second clock signal input end, a third clock signal input end, a signal input end, a luminescence control signal output end, a constant high level voltage signal end and a constant low level voltage signal end, wherein an input control unit, a first pull-down unit, a second pull-down unit, a first pull-up unit and a second pull-up unit are connected between the signal input end and the luminescence control signal output end. The invention further provides a shift register, grid control nodes of ninth and tenth film transistors of an output level TFT have stable and controllable work voltages at each work stage, the ninth and tenth film transistors realize conduction by turns, and the simultaneous turn-off situation does not occur. According to the circuit, circuit output signal waveforms are stable, grid reliability is high, after simulation verification, output signal waveforms of each level of cascade circuits are stable.