The invention provides a grid driving circuit and method. The circuit comprises a dead zone time control module, a first inverter, a delay module, a second inverter, a clamping module and driving tubes, wherein the dead zone time control module generates first and second control signals which are not overlapped, the first inverter obtains an inverted signal of the second control signal, the delay module generates third and fourth control signals, the second inverter obtains an inverted signal of the third control signal, and the clamping module clamps the grid voltage of a pre-driving tube. In the process that a power switch tube is connected, the grid voltage of the pre-driving tube is clamped, so that time of a Miller plateau is independent from the power voltage. A pulse synchronized within independent connection time of the pre-driving tube is introduced, the driving voltage of the pre-driving tube is clamped in a fixed potential within the time, so that time of the Miller plateau, dV/dt in the drain end of the power switch tube and EMI amplitude do not change with the power voltage, and a proper driving capability is easy to select.