The invention discloses a multi-mode data transformation service (DTS) interconnection method based on power flow matching and computation model splicing, comprising the following steps: 1) establishing a mapping relationship of provincial/regional overlapped equipment on a regional dispatching side, and defining equipment needing to send power flow data to the provincial dispatching and equipment needing to acquire the power flow data from the provincial dispatching on the regional dispatching side; 2) defining information of each sub-system participating in network interconnection; 3) establishing interconnection communication processes in province and region respectively; 4) transforming the existing DTS power flow computation modules of the province and region so as to adapt to the interconnection requirements; and 5) after the network interconnection is started, sending messages of the system to other interconnection sub-systems in real time by the interconnection communication processes, and receiving messages of other sub-systems, and processing the messages by a power flow module. Through the method of the invention, the provincial dispatching can acquire relatively accurate computation result without a large amount of splicing computation, and the regional dispatching can really reflect influence of the change of an external network mode on the local network through the splicing computation of the computation model.