Unidirectional physics isolation type network safety device

The utility model relates to a unidirectional physical isolation type network safety device which belongs to the field of network safety and solves the contradiction between the absolute safety protection of an internal network and the unidirectional data transmission from the internal network to an external network. The utility model is characterized in that a closed computer case with an internal computer outwards provides only one network input port and one network output port which are respectively connected with the internal network and the external network. By a network driving stage unidirectional control technology and that an output network cable of the network input port and an input network cable of the network output port in the computer case are cut off, unidirectional complete isolation from any connection with the external network can be realized; meanwhile, the function of the unidirectional data transmission from the internal network to an external network can also be realized; the security check, filtrating and parsing of application layer data is once again packaged additionally in an export technology. The innovative design of full-solidified idiot-type plug-and-play which is free of management and misoperation additionally increases the safety; the utility model is suitable for the situations of the unidirectional data transmission and that the highest safety is required to the internal network, such as a production control system transmits production real-time data to a management information system.