The secure transmission of power information data, especially the international business data, determines the safety of the entire grid network. The unconditional security of quantum communication technology can greatly improve the security of system data transmission and provide the detectability of eavesdropping. A scheme is proposed for the international business data transmission in the international grid network based on measurement-device-independent quantum key distribution(MDI-QKD) protocol, where a plug and play structure is adopted due to the characteristics of the international business data transmisssion. The scheme includes the control and measure center, extranet international business zone and overseas transmission front area. The control and measure center is in charge of the generation of light pulse and Bell measurements. The extranet international business zone and overseas transmission front area are connected with virtual private network (VPN) via key management ports to encryt data. The feasibility of the proposed scheme is verified by theoretical analysis.