The invention discloses a system capable of guaranteeing parameter test work safety of an ac/dc (alternating current/direct current) transmission line. The system comprises a coordination working surface interaction module, a communication module and a centralized control module of all working surfaces, wherein the modules are connected in sequence, the coordination working surface interaction module receives a wired voice command, outputs field coordination safety situation images and carries out information interaction; the communication module is used for transmitting the images and voice information of the coordination working surface interaction module to the centralized control module of all working surfaces and is also used for transmitting commands of the centralized control module of all working surfaces in a wireless mode; and the centralized control module of all working surfaces masters the coordination situation of all working surfaces, realizes safety supervision and supervises and reminds the site working behavior violating the electric power security regulations in the form of voice. With the adoption of the system, the parameter test safety of the ac/dc transmission line is greatly improved, the problems of instrument damage and personal injury caused by wrong wiring in the existing method are solved, and the technological development of the parameter test safety of the transmission line is powerfully promoted.