Currently,　ammonia　is　an　important　chemical　in　modern　society,　widely　used　in　agriculture　and　energy-conversion　fields.　However,　there　are　existing　energy-consumption　and　environmental　problems　in　the　traditional　process　of　ammonia　synthesis.　At　present,　electrochemical　nitrate　reduction　reaction　(NO3-RR)　uses　renewable　electricity　as　power　to　achieve　simultaneous　nitrate　removal　and　ammonia　generation,　providing　an　efficient,　green　and　clean　platform　for　sustainable　ammonia　synthesis.　As　an　ideal　model　material　for　electrochemistry　research,　two-dimensional　(2D)　materials　with　tunable　surface　properties　and　electronic　structure　have　aroused　immense　interest　in　electrocatalysis　applications.　The　atomic-layer　structure　of　2D　materials　can　significantly　affect　their　physical/chemical　properties,　while　size　and　surface　characteristics　are　important　aspects　to　be　considered　for　designing　and　synthesizing　efficient　catalysts　to　achieve　the　high　performance　of　the　electrocatalytic　NO3-RR　application.　In　this　review,　we　discuss　the　fundamentals　of　electrocatalytic　nitrate　reduction　to　ammonia　including　reaction　mechanisms　and　basic　research　methods.　Moreover,　synthetic　methods　and　design　strategies　of　2D-material　electrocatalysts　are　introduced　and　specific　applications　of　2D　material　in　electrocatalytic　NO3-RR　are　demonstrated.　Furthermore,　future　perspectives　are　proposed　to　inspire　novel　attempts　for　new　2D　materials　applications　across　broad　fields.