A CAN bus explosion proof network comprising a safe region and a dangerous region, where a plurality of explosion proof node structures are distributed in the dangerous region, the explosion proof node structure comprises: a physical parameter sensor, a physical parameter measurement circuit, a master controller, a communication interface module, a data storage module, and a power voltage and current limiting module; wherein the physical parameter sensor is configured to collect one or more physical parameters and convert them into electrical signals; wherein the physical parameter measurement circuit is configured to convert the electrical signals converted from physical parameters by the physical parameter sensor into digital signals and transfer them to the master controller; wherein the master controller is configured to perform respective service processing on the digital signals and send them to the communication interface module; wherein the data storage module is configured to store related data required for node operation; wherein the communication interface module is configured to send the processed digital signals as CAN signals; wherein the power voltage and current limiting module is designed with the intrinsic safety technology, and wherein the power voltage and current limiting module is configured to limit a maximum open circuit voltage and a maximum short circuit current of the input power, characterized in that all the digital signals in the explosion proof network are transmitted via CAN bus, and in that the exposition proof network comprising a CAN bus safety gate that is disposed in the safe region or the dangerous region and is designed with intrinsic safety technology and isolation technology, wherein each explosion proof node structure is connected to the CAN bus safety gate and thereby constitute a plurality of small topological networks. a physical parameter sensor, a physical parameter measurement circuit, a master controller, a communication interface module, a data storage module, and a power voltage and current limiting module; wherein the physical parameter sensor is configured to collect one or more physical parameters and convert them into electrical signals; wherein the physical parameter measurement circuit is configured to convert the electrical signals converted from physical parameters by the physical parameter sensor into digital signals and transfer them to the master controller; wherein the master controller is configured to perform respective service processing on the digital signals and send them to the communication interface module; wherein the data storage module is configured to store related data required for node operation; wherein the communication interface module is configured to send the processed digital signals as CAN signals; wherein the power voltage and current limiting module is designed with the intrinsic safety technology, and wherein the power voltage and current limiting module is configured to limit a maximum open circuit voltage and a maximum short circuit current of the input power, characterized in that all the digital signals in the explosion proof network are transmitted via CAN bus, and in that the exposition proof network comprising a CAN bus safety gate that is disposed in the safe region or the dangerous region and is designed with intrinsic safety technology and isolation technology, wherein each explosion proof node structure is connected to the CAN bus safety gate and thereby constitute a plurality of small topological networks.