The invention discloses an adhesive tape conveying and grabbing mechanism for a carton adhesive tape sealing machine. The adhesive tape conveying and grabbing mechanism comprises a machine frame. An adhesive tape drum connection frame is fixed to the left side of an upper supporting plate of the machine frame. Roller adhesive tape is arranged on the adhesive tape drum connection frame. An adhesive tape guide block is fixed to the position, close to the adhesive tape drum connection frame, of the left side of the upper supporting plate. A guide groove is formed in the adhesive tape guide block. The adhesive tape end of the roller adhesive tape is inserted in the guide groove and extends out of the guide groove. An adhesive tape grabbing air cylinder is fixedly arranged at the bottom of the adhesive tape guide block. A push rod of the adhesive tape grabbing air cylinder is fixedly provided with an adhesive tape clamping block. An adhesive tape circulation groove is formed in the middle of the adhesive tape clamping block. The adhesive tape end of the roller adhesive tape is inserted in the adhesive tape circulation groove and extends out of the adhesive tape circulation groove. The adhesive tape conveying and grabbing mechanism is installed on an automatic adhesive tape bonding device, and can automatically grab and convey adhesive tape to a bonding layer of a right pressing block of the automatic adhesive tape bonding device, the adhesive tape is pulled out through the movement of the right pressing block without manual operation, efficiency is improved, and labor intensity of workers is lowered.