Adjustable cantilever support

The utility model relates to the technical field of cantilever supports, and discloses an adjustable cantilever support. The adjustable cantilever support comprises a base, the inner wall of the bottom end of the base is in threaded connection with a threaded rod, a protruding structure above the base is rotationally connected with a supporting frame, the inner wall of the top end of the supporting frame is rotationally connected with a connecting frame a, the inner wall of the supporting frame is fixedly connected with a center shaft, and the inner wall of the center shaft is elastically connected with a rotating assembly through a reset spring a; a connector is rotatably connected to the tail end of the left side of the connecting frame b; a mounting seat is detachably connected to the inner wall of the connector; a mounting block is fixedly connected to the back surface of the mounting seat; a rectangular block is elastically connected to the inner wall of the connector through a reset spring b; pull rods