The invention discloses an industrial control system network security situation sensing system based on artificial intelligence. The system comprises a virus monitoring unit, a data parsing unit, a data fusion and calculation unit, a fusion and calculation rule library, an Internet speed monitoring unit, a usage monitoring unit, a controller, a display unit, a database, an input unit and a steady-state analysis unit. In the system provided by the invention, a virus attack attacking the system is analyzed and judged through the virus monitoring unit and the data parsing unit; then, real-time Internet speed of a security network is monitored and analyzed through the Internet speed monitoring unit, and a steady-state valve group of the Internet speed is obtained; meanwhile, usage rate of a CPU is monitored in real time through the monitoring unit; then, comprehensive analysis is executed in combination with latest virus attack frequency, the steady-state valve group and the real-time usage rate, thus, an evaluation signal is obtained, and different evaluation signals are transmitted to the database for storage.