A vehicle mutual-charging system, comprising: a first electric vehicle and a second electric vehicle, each of the first electric vehicle and the second electric vehicle comprising a power battery, an energy control device and a charge-discharge socket, wherein the energy control device comprises: a three-level bidirectional DC-AC module having a first DC terminal connected with a first terminal of the power battery and a second DC terminal connected with a second terminal of the power battery, a charge-discharge control module having a first terminal with three phases connected with an AC terminal of the three-level bidirectional DC-AC module and a second terminal with three phases connected with the charge-discharge socket, a control module connected with a third terminal of the charge-discharge control module and configured to control the charge-discharge control module according to a current working mode of the vehicle; characterized by a charging connector connected between the first electric vehicle and the second electric vehicle and comprising a first charging gun adaptor and a second charging gun adaptor at both ends thereof respectively, wherein the first charging gun adaptor is connected with the charge-discharge socket of the first electric vehicle and the second charging gun adaptor is connected with the charge-discharge socket of the second electric vehicle, and wherein the first electric vehicle is configured to charge the second electric vehicle via three phases in AC mode via the charging connector, when the current working mode of the first electric vehicle is a discharging mode and the current working mode of the second electric vehicle is a charging mode, wherein the energy control device further comprises: a first common-mode capacitor and a second common-mode capacitor connected in series and connected between the first terminal and the second terminal of the power battery, in which a node between the first common-mode capacitor and the second common-mode capacitor is grounded. a first electric vehicle and a second electric vehicle, each of the first electric vehicle and the second electric vehicle comprising a power battery, an energy control device and a charge-discharge socket, wherein the energy control device comprises: a three-level bidirectional DC-AC module having a first DC terminal connected with a first terminal of the power battery and a second DC terminal connected with a second terminal of the power battery, a charge-discharge control module having a first terminal with three phases connected with an AC terminal of the three-level bidirectional DC-AC module and a second terminal with three phases connected with the charge-discharge socket, a control module connected with a third terminal of the charge-discharge control module and configured to control the charge-discharge control module according to a current working mode of the vehicle; characterized by a charging connector connected between the first electric vehicle and the second electric vehicle and comprising a first charging gun adaptor and a second charging gun adaptor at both ends thereof respectively, wherein the first charging gun adaptor is connected with the charge-discharge socket of the first electric vehicle and the second charging gun adaptor is connected with the charge-discharge socket of the second electric vehicle, and a three-level bidirectional DC-AC module having a first DC terminal connected with a first terminal of the power battery and a second DC terminal connected with a second terminal of the power battery, a charge-discharge control module having a first terminal with three phases connected with an AC terminal of the three-level bidirectional DC-AC module and a second terminal with three phases connected with the charge-discharge socket, a control module connected with a third terminal of the charge-discharge control module and configured to control the charge-discharge control module according to a current working mode of the vehicle; characterized by a charging connector connected between the first electric vehicle and the second electric vehicle and comprising a first charging gun adaptor and a second charging gun adaptor at both ends thereof respectively, wherein the first charging gun adaptor is connected with the charge-discharge socket of the first electric vehicle and the second charging gun adaptor is connected with the charge-discharge socket of the second electric vehicle, and wherein the first electric vehicle is configured to charge the second electric vehicle via three phases in AC mode via the charging connector, when the current working mode of the first electric vehicle is a discharging mode and the current working mode of the second electric vehicle is a charging mode, wherein the energy control device further comprises: a first common-mode capacitor and a second common-mode capacitor connected in series and connected between the first terminal and the second terminal of the power battery, in which a node between the first common-mode capacitor and the second common-mode capacitor is grounded. a first common-mode capacitor and a second common-mode capacitor connected in series and connected between the first terminal and the second terminal of the power battery, in which a node between the first common-mode capacitor and the second common-mode capacitor is grounded.