An unlocking device for an optical module includes a casting main body (6), a spring (7), a slide block (15) and a pulling ring (1). The bottom of the casting main body is provided with a chute (8) for the slide block, wherein the rear end of the chute is provided with a limitation bump (9) for preventing the spring from running over. The middle part of the slide block is provided with a groove (14) for holding the spring. The lower end of the pulling ring is provided with an opening (3), wherein two sides of the opening are mounted at the bottom of the casting main body. Each side of the opening is provided with a bump (2).
