Round straw bundle release control device and method for round straw bundle bundling machine

The invention discloses a round straw bundle release control device and method for a round straw bundle bundling machine. The device comprises a rear roller backpack opening and closing oil cylinder, a locking pull hook, a rolling shaft, a tension spring, a sensor signaling mechanism, a locking pull hook opening limit plate and a locking pull hook floating support mechanism, wherein the two ends of the rear roller backpack opening and closing oil cylinder are respectively hinged to a rear roller backpack and the rear end of the locking pull hook; a hook part at the front end of the locking pull hook hooks the rolling shaft; the upper end of the tension spring hooks the middle part of the locking pull hook, and the lower end of the tension spring hooks the lower part of a front roller chamber; the sensor signaling mechanism is arranged on the lower side of the tension spring; the rear part of the locking pull hook is hinged to the lower part of the front roller chamber through a supporting mandrel; the locking