The invention discloses a catching technology based information interaction bus data reliable-transmission method. The caching technology based information interaction bus data reliable-transmission method includes steps of receiving original data by a transmission end in an information interaction bus, packaging the original data and forming data packets; caching the data packets and transmitting to the receiving end of the information interaction bus; after the receiving end receives the data packets, subjecting the data packets to packaging and information analysis, judging continuity and integrity of the data packets and transmitting commands to control equipment; and controlling by the control equipment according to the commands. By means of the caching technology based information interaction bus data reliable-transmission method, the problem that information interaction buses are easy to lose in the process of data transmission crossing physical isolation equipment can be solved, transmission obstacles caused by the physical isolation equipment and the network environment and the like are overcome within a certain range, and internal data transmission of the power secondary system is kept safe, stable and efficient.