A packing machine core and a strap cutting and ironing adhering method, including: a control mechanism, a packing strap ironing adhering and strap catting mechanism, an ironing adhering sliding plate mechanism, and a machine core bracket, where the control mechanism includes a machine core mainshaft and a mainshaft motor. Multiple control cams are mounted on the machine core mainshaft and include multiple cams for controlling the ironing adhering and strap cutting mechanism and a first cam for controlling a swinging arm of the ironing adhering sliding plate mechanism. The mainshaft motor drives, by a speed reducing mechanism, the machine core mainshaft to rotate, and the multiple cams for controlling the ironing adhering and strap cutting mechanism include a left cutter cam, a middle cutter earn, a right cutter cam, and a second cam for controlling a swinging arm of an ironing head to work.