Special line physical isolation industrial data communication method and system

The invention relates to a special line physical isolation industrial data communication method and system. A data collector and a physical isolator cooperate with each other, the data collector is responsible for collecting node data of an enterprise through an internal internet of the enterprise or in a wired or wireless communication mode and converts the node data into an encrypted message, the physical isolator is responsible for performing secondary encryption on the data and issuing standard data to a cloud platform through the internet, and the data collector and the physical isolator performs data interaction through a special data passage. The data transmitted by the special data passage are subjected to algorithm encryption processing, communication is performed in the form of the encrypted message, and only the data in the format of the encrypted message can pass through the two ends of the special data passage. A special medium is adopted in the special passage communication and is not the Ethern