Automatic tape changing device, sealing and labeling machine and automatic tape changing method

The invention provides an automatic tape changing device, a sealing and labeling machine and an automatic tape changing method. The automatic tape changing device comprises a winding ring, a plurality of tape winding mechanisms, a rotary power mechanism, a tape changing and positioning mechanism, a tape changing detection mechanism and a push rod mechanism, wherein each tape winding mechanism comprises a corresponding cylinder seat, a corresponding tape reel, a corresponding winding cylinder and a corresponding adhesive tape, the cylinder seats and the tape reels are fixed on the winding ring, the winding cylinders are clamped in the cylinder seats, the adhesive tapes are wound around the tape reels, one ends of the adhesive tapes are fixed on the winding cylinders, the push rod mechanism can be inserted into the winding cylinders, and the winding cylinders are separated from the cylinder seats when the winding ring rotates. According to the automatic tape changing device, the plurality of tape winding mechan