The invention discloses a smart city public network system comprising a total server, a public network platform, and a city public database; the total server is respectively connected with the city public database and an ID verification platform; the ID verification platform is connected with the public network platform, and comprises a mobile communication server and a police information server; the public network platform comprises a network server and a network connecting terminal; the city public database comprises a library, a business database, a traffic database and a municipal database. The smart city public network system uses the mobile communication server and the police information server to carry out dual-verification for the citizen identity, and allows the citizens passing the verification to use the network server to visit the city pubic database contents, thus ensuring citizen internet safety, and providing more comprehensive resources for the citizens.