Disclosed is a gate driving unit and a driving circuit, the gate driving unit comprising a pull-up control unit for generating a scanning control signal; a pull-up cascade transmission unit for converting a scanning clock signal into a line scanning signal; a pull-down unit for pulling down the scanning control signal and the line scanning signal to a low level; and a pull-down maintaining unit for maintaining the scanning control signal and the line scanning signal at the low level. The gate driving unit increases the reliability of the gate driving circuit.