A pixel scan drive circuit including a switch unit, a pull-up output unit and a pull-down output unit is provided. In a scan signal output phase of a scanning cycle, the pull-down output unit outputs a first reference voltage in a scan signal to an output end according to a clock signal. In a maintenance phase of the scanning cycle, the switch unit controls the voltage of a pull-down node according to a switch control signal, thereby controlling the pull-down output unit to stop outputting the first reference voltage. In the maintenance phase, the pull-up output unit outputs a second reference voltage in the scan signal. The second reference voltage controls the pixel units to stop receiving the image data. Transistors in the switch unit are of different types from transistors in the pull-up output unit and the pull-down output unit. An array substrate and a display terminal are provided.