The invention discloses a production line equipment visualization fault diagnosis method. Motion execution signals and the address information are outputted by a PLC processor through a CC-LINK main station module to remote I/O modules, if feedback signals of machine tools and robot controllers are not received within the prescribed time, a fault alarm is outputted to a man-machine interaction interface. The method is advantaged in that through setting a timing feedback mechanism, fault detection on the machine tools and robots is carried out, after the remote I/O module address information, the machine tool and robot number information and the corresponding motion execution signals are emitted by the PLC processor, if the feedback signals of the machine tools and the robots are not received within the prescribed time, which machine tool or robot generates faults when a certain motion is executed can be determined clearly, the fault position of the equipment can be rapidly positioned by workers, the equipment maintenance time is shortened, and production efficiency is improved.