An adjustable automatic positioning hinge for a glass door has a doorframe bracket, a body, a spindle, a U-shaped male bracket and a U-shaped female bracket. The U-shaped male bracket and the U-shaped female bracket face and are attached to each other. The body is attached to the doorframe bracket, the U-shaped male bracket, the U-shaped female bracket and the spindle pivot relative to the body. A glass door is clamped between the U-shaped male bracket and the U-shaped female bracket. A spindle anchor hole is formed in central protrusion on the male bracket. The spindle has a first threaded hole and a second threaded hole radially formed in the spindle at an obtuse angle and setscrews screwed through the central protrusion into the first threaded hole and the second threaded hole hold and can be used to adjust the spindle.