Self-adaptive interface accessory equipment

The utility model discloses a self-adaptive interface fitting device, comprising a back clamp assembly comprising a bottom shell, a first clamping block installed at one end portion of the bottom shell and a second clamping block installed at the other end portion of the bottom shell, the first clamping block and the second clamping block being used for clamping two ends of a terminal device; the connecting assembly is arranged on the first clamping block and comprises a plug component, and the plug component is rotatably connected to the interior of the first clamping block, so that the included angle between the orientation of the plug component and the bottom shell can be changed between zero degree and a first angle, and the connecting assembly can be connected with the terminal equipment and rotate along with the terminal equipment. Therefore, operation is convenient, the plug is not prone to being damaged due to stress, and the problem that an obliquely-inserted plug is prone to being damaged is solved.