The invention discloses a dual-mode petrochemical safety sensing device optimization device and method based on a 4G technology, and belongs to the field of petrochemical safety. In the normal state of the device, data are transmitted through a wired cable; when an operator determines that a wired cable line cannot complete data transmission, a 4G communication module line is started for data transmission, a logical processing unit processes 4G communication module line related data, and processing on wired cable line related data is stopped at the same time; when the operator determines thatnormal communication of the wired cable line is recovered, the wired cable line is started for data transmission, the 4G communication module is closed at the same time, the logical processing unit processes the wired cable line related data, and processing on the 4G communication module line related data is stopped at the same time; and the logical processing unit sends related action instructions to an execution unit, and the execution unit performs corresponding operation. According to the device and the method, the instability factors generated during field wiring are effectively reduced,and an existing petrochemical safety sensing device is optimized.