The invention discloses an AC/DC hybrid microgrid group serial-parallel hybrid network structure, a control system and an operation control method. The AC/DC hybrid intelligent microgrid group networkstructure comprises a plurality of AC series sub-microgrids, an AC parallel sub-microgrid, a DC sub-microgrid and a plurality of flexible DC distribution systems. Each AC series sub-microgrid, the ACparallel sub-microgrid and the DC sub-microgrid are connected in series-parallel hybrid mode through the flexible DC distribution systems. The AC distribution network is connected with the first AC series sub-microgrid through a PCC point switch of microgrid group. All the AC series sub-microgrids are connected serially through the adjacent flexible DC distribution system converter valve and theDC bus in sequence to form a series network topology structure. Each DC sub-microgrid is accessed to the DC bus of the corresponding flexible DC distribution system through a bi-directional DC/DC converter. Each AC parallel sub-microgrid is accessed in parallel to the DC bus of the serially connected flexible DC distribution systems through the flexible DC distribution system parallel converter valve.