The utility model discloses an electric vehicle charging system with AC/DC charging functions. The electric vehicle charging system comprises a transformer, a filter, an AC/DC converter, a relay, a one-chip microcomputer, a storage device and a cell interface. The relay comprises a normally open contact, a normally closed contact and a coil. The transformer, the filter, the AC/DC converter, the normally open contact, the cell interface and a cell are connected in sequence. One end of the normally closed contact is connected with the connection end of the filter and the AC/DC converter, while the other end is connected with the cell interface. The one-chip microcomputer is connected with the cell interface, the storage device and the coil respectively. Through the electric vehicle charging system with the AC/DC charging functions, the charging mode can be determined through detecting cell parameters; and the application scope is wide.