Full-automatic sewing thread packaging machine

The invention discloses a full-automatic sewing thread packaging machine. The full-automatic sewing thread packaging machine comprises a control system, a machine frame, a conveying device, a contracting device, a conveying belt, a labeling device and a bagging device, wherein the conveying device, the contracting device and the conveying belt are all arranged on the machine frame, and the labeling device and the bagging device are sequentially arranged on the conveying belt. The control system comprises a main control circuit board, a first isolating circuit and a second isolating circuit, wherein the main control circuit board is coupled to an external manipulator and an external sensor to receive an induction signal output by the sensor and send out a driving signal to the manipulator so as to drive the manipulator to act; the first isolating circuit is coupled between the main control circuit board and the external manipulator to electrically isolate the communication between the main control circuit boar