A hinge with a positioning and limiting assembly is mounted on an electronic device with a camera and has a stationary bracket, a pivot cylinder, a stationary positioning ring and a rotating positioning ring. The stationary bracket is attached to the electronic device and has a mounting ring. The pivot cylinder is mounted rotatably through the mounting ring. The stationary positioning ring is mounted around the pivot cylinder, connects to the mounting ring and has a positioning protrusion formed on and protruding from the stationary positioning ring. The rotating positioning ring is connected to the pivot cylinder, presses against the stationary positioning ring and has multiple detents. The detents engage the positioning protrusion to hold the camera lens in place.