The invention relates to a height-adjustable ball hinge. The height-adjustable ball hinge comprises a frame plate (1), a frame plate cylinder (2), a frame plate winding drum (3), a pin (4), a sector plate (6), a sector plate cylinder (7), a sector plate winding drum (8), a rotating shaft (9) and balls (10). By rotating the rotating shaft (9), the height of a door plate relative to a door frame canbe adjusted, and thus convenience is brought for mounting or maintenance; the inclined plane principle in physics is applied in rising and falling of the rotating shaft (9), so that effort saving isachieved in rotation of the rotating shaft (9); rotation of the rotating shaft (9) can be controlled through the pin (4), and thus mistaken rotation of the rotating shaft (9) due to vibration or friction does not need to be worried at ordinary times; rotation of the sector plate (6) relative to the frame plate (1) is achieved through rolling of the balls (10), rolling friction force is small, andthe lubricating effect of lubricating oil is achieved, so that effort saving is achieved at the time of door closing and door opening, and abrasion is not liable to occur; the structure is simple, themanufacturing cost is low, manufacturing is easy, and popularization is easy; and the height-adjustable ball hinge is obtained by improving a hinge which is a wonderful invention in traditional Chinese culture, sublimated in the aspect of practicability and carried forward and keeps pace with the times.