An automatic adhesive tape dispenser, comprising a housing (5,12), an adhesive tape mount bracket provided in the housing, a transportation mechanism provided between an adhesive tape discharge opening of the housing (5,12) and the adhesive tape mount bracket, and a cutting mechanism provided between the transportation mechanism and the adhesive tape discharge opening, wherein a movable button is provided on the housing (5,12), an elastic return member is provided between the button and the housing (5,12), the button transmits an external force applied thereon to the transportation mechanism by a drive mechanism, so that the transportation mechanism is rotated and transports an adhesive tape towards the adhesive tape discharge opening, a cutting control mechanism is provided between the drive mechanism and the cutting mechanism, when the external force is removed from the button, the drive mechanism transmits a return force of the elastic return member to the cutting mechanism by the cutting control mechanism, so that the cutting mechanism is rotated and cuts off the adhesive tape; the drive mechanism comprises a connecting member which is provided on the button and has teeth, a double linked gear and a rack, a small gear of the double linked gear is engaged with the connecting member with teeth, a big gear of the double linked gear is engaged with a rear end of the rack, a guide groove for the rack and support shafts for respectively fixing the double linked gear and the button are provided on an inner wall of a lower portion of the housing; and the transportation mechanism comprises a one-way pawl, a big roller, a rubber ring, the one-way pawl and pawl of an inner side of the big roller form a ratchet wheel assembly, and wherein the transportation mechanism is characterized by also comprising a small roller and a transportation wheel, and by the fact that teeth of the one-way pawl are engaged with straight teeth of the rack; the big roller, the small roller and the transportation wheel are connected by the rubber ring; the small roller is disposed on a small roller bracket, two raised ribs protruding above a top surface of the small roller bracket are respectively provided at two sides of the small roller bracket; a support shaft for tightening a rubber belt along with ratchet wheel assembly is provided in the lower portion of the housing, and a support shaft for fixing the one-way pawl is provided on the inner wall of the lower portion of the housing. a movable button is provided on the housing (5,12), an elastic return member is provided between the button and the housing (5,12), the button transmits an external force applied thereon to the transportation mechanism by a drive mechanism, so that the transportation mechanism is rotated and transports an adhesive tape towards the adhesive tape discharge opening, a cutting control mechanism is provided between the drive mechanism and the cutting mechanism, when the external force is removed from the button, the drive mechanism transmits a return force of the elastic return member to the cutting mechanism by the cutting control mechanism, so that the cutting mechanism is rotated and cuts off the adhesive tape; the drive mechanism comprises a connecting member which is provided on the button and has teeth, a double linked gear and a rack, a small gear of the double linked gear is engaged with the connecting member with teeth, a big gear of the double linked gear is engaged with a rear end of the rack, a guide groove for the rack and support shafts for respectively fixing the double linked gear and the button are provided on an inner wall of a lower portion of the housing; and the transportation mechanism comprises a one-way pawl, a big roller, a rubber ring, the one-way pawl and pawl of an inner side of the big roller form a ratchet wheel assembly,