The invention relates to a double-loop topological structure comprising a four-port flexible switch for a medium voltage distribution network. The double-loop topological structure is characterized inthat the double-loop topological structure comprises a first looped network topological structure module, a second looped network topological structure module, first power supplies, second power supplies and a four-port flexible straight module; the power input ends of the first looped network topological structure module are connected with the first power supplies correspondingly; the power output ends of the first looped network topological structure module are connected with a first alternating current port and a second alternating current port of the four-port flexible straight module; the power input ends of the second looped network topological structure module are connected with the second power supplies correspondingly; the power output ends of the second looped network topological structure module are connected with a third alternating current port and a fourth alternating current port of the four-port flexible straight module; and the load ends of the first looped network topological structure module and the second looped network topological structure module are connected with the client. The double-loop topological structure can be widely applied to the field of designof the medium voltage distribution networks with high reliability performance.