In order to solve the problem that devices with different communication protocols cannot communicate in the industrial field,and the hidden danger in the process of plaintext data communication,an industrial intelligent encryption gateway device based on multi-protocol conversion of embedded technology is designed.The design principles and strategies of the main subsystems of the gateway are introduced from the perspective of system design:core controller module,protocol communication module,communication encryption module and human-computer interface.From the point of view of software function design,the strategy and method of protocol conversion of core controller are introduced.The gateway can connect different communication protocol devices,realize the mutual conversion function of multiple protocols,encrypt data transmission,and intelligently complete the information exchange between heterogeneous networks.