Bottle cap internal thread machining device

The utility model provides a bottle cap internal thread machining device. The bottle cap internal thread machining device at least comprises a bottle cap conveying device, a bottle cap input device, a thread pressing device and a bottle cap output device. The bottle cap conveying device comprises a plurality of bottle cap conveying units and a conveying driving device for driving the bottle cap conveying units to move, and each conveying unit is provided with a bottle cap containing groove. The conveying driving device is configured to drive the conveying unit to move to the input position, the machining position and the output position, and the conveying unit continuously moves according to the sequence that the conveying unit sequentially moves to the input position, the machining position and the output position and then returns to the input position. The bottle cap input device is arranged at the input position. The thread pressing device is arranged at the machining position. And the bottle cap output de