Grass-roots governance is an important part of the national governance. The modernization of national governance needs the modernization of grass-roots governance. Relying on modern information technology，especially with the help of Mobile Internet，to promote the reform and reconstruction of grass-roots governance is an important way to promote the modernization of grass-roots governance. Firstly，this paper expounds the new connotation of grass-roots governance in the era of Mobile Internet，then focuses on the role and significance of Mobile Internet in improving grass-roots governance，especially its important role and effectiveness in creating a new governance model，reshaping a new form of governance，opening up new channels of governance and expanding new space of governance. Finally，it puts forward policy suggestions to improve grass-roots governance.