In order to improve the stability of system operation, high compensation series compensation devices have been widely used. However, after a line fault, there are low-frequency components with high amplitude in the secondary arc current, making it difficult for the secondary arc to self extinguish. In response to this issue, the impact of series compensation on the amplitude of secondary arc current and recovery voltage were studied under different arrangements of AC/DC hybrid transmission lines, and a method of FSC and TCSC hybrid multiplexing was proposed to suppress secondary arc in this article. In addition, to meet the demand for high compensation degree in the line, the optimal configuration scheme for series compensation degree was designed with FSC and TCSC mixed multiplexing. The results show that a series compensation degree of 40% in a dual platform decentralized layout in the AC/DC hybrid transmission line, the minimum amplitude of the secondary arc current and recovery voltage are realized, and the shortest arcing time is also realized. In high compensation series compensation lines, when a configuration scheme with series compensation of 10% and 20% in the TCSC, it is more conducive to arc extinguishing and the success rate of reclosing.