The invention provides an automatic recording system for running time of a production line device, belonging to the recording field of the running time of the production line device. The automatic recording system for running time of a production line device provided by the invention comprises a real-time data collecting device, a back-stage management device, a display terminal, a production linearea L2 system, a production line area L1 system, a BD1 rolling mill PLC, a TM rolling mill PLC, a 1st processing line PLC, a 2nd processing line PLC, a 3rd processing line PLC, a hardware firewall,and an enterprise local area network. The automatic recording system can reduce manual labor, increases the recording real-time, reality and accuracy of the running time of the production line deviceand the labor production operation performance.