A scan driving circuit is provided. The scan driving circuit includes a pull-up control module, a pull-up module, a pull-down module, a pull-down maintenance module, a bootstrap capacitor, and a low-level constant source. The pull-up control module herein is respectively coupled to the pull-up module, the pull-down module, the pull-down maintenance module, and the bootstrap capacitor; the low-level constant source is respectively coupled to the pull-down maintenance module and the pull-down module. The present invention can avoid a leakage phenomenon well and improve reliability of the scan driving circuit.