The invention belongs to the technical field of display, and particularly relates to a shift register unit, a driving method thereof and a grid driving circuit. In the shift register unit, an input module is used for outputting an input signal to a pull-up node under the control of a first clock signal of a first clock signal end; an output module is used for outputting a second clock signal of the second clock signal end to the output end under the control of the potential of the pull-up node; a reset module is used for resetting the potentials of the pull-up node and the output end under thecontrol of the potential of the pull-down node; a reset control module is used for controlling the potential of the pull-down node so as to reset the potential of the pull-up node and the output endto the first level signal. According to the shifting register unit and the corresponding driving method thereof, self-resetting is achieved through the circuit structure of the shifting register unit,a next shifting register unit does not need to reset signals for a previous shifting register unit, power consumption is low, the number of signal lines is small, the circuit structure and layout wiring are simplified, and narrow frame design is facilitated.