An embodiment of the invention discloses a spinning machine broken yarn monitoring and forecasting device which comprises a bobbin, a winding drum, a laser emitter, a photoelectric sensor, an alarm and a wireless communication module. Axis of the bobbin is connected with a first motor, axis of the winding drum is connected with a second motor, the winding drum and the bobbin are arranged at an interval and are parallel in axis, yarn is bound between the bobbin and the winding drum, the laser emitter is arranged on one side of the yarn and faces the yarn, the photoelectric sensor is arranged on one side, away from the laser emitter, of the yarn and electrically connected with the first motor and the second motor, the alarm is electrically connected with the photoelectric sensor, and the wireless communication module is electrically connected with the photoelectric sensor. The spinning machine broken yarn monitoring and forecasting device has the advantages that the device can monitor thickness of the yarn and adjust rotating speed of the two motors according to data, so that breakage caused by the fact that the yarn is stressed excessively is avoided effectively.