The utility model provides a rapid dismounting device for a plug-in cable terminal. The positioning hoop is arranged to realize the positioning of the cable terminal. After the supporting baffle and the adjusting nut are installed on the connecting screw rod, the adjusting nut is rotated to enable the supporting baffle to abut against the box body, then the adjusting nut is further rotated to enable the outer end of the connecting screw rod to axially move towards the outer side relative to the supporting baffle, and pulling of one side edge of the plug head is achieved; similarly, by rotatingthe adjusting nut on the other side, the two side edges of the plugging head can be pulled and adjusted correspondingly, and more labor is saved during operation; the cable terminal disassembling tool is simple to operate, can be operated by a single person, does not need to carry other tools such as wrenches, and greatly improves the cable terminal disassembling efficiency.