Tyre external caterpillar band

The utility model relates to a tyre external track, comprising a track plate, a rib, a tack hole, a wing plate, a connecting plate, a pin-and-hole plate, and a track gear. Both ends of the track plate are equipped with the pin-and-hole plates which are longitudinally arranged corresponding to the track plate; the pin-and-hole plate which is used for being connected with the connecting plate presents the parallel dual-plate form. The identical track plates which are assembled through the connecting plates are jointly composed to be the tyre external tracks which have suitable lengths. The inward track plate of the pin-and-hole plate is equipped with the wing plate in the inclined form, while in use, the tyre is fastened on the track plate in the wing plate. The inner surfaces of the track plates are equipped with the ribs which are matched with the transverse ditches on the surface of the tyre; the track plates on both ends of the ribs are equipped with the tack holes which are used for installing the rubber plate. The lower end of the wing plate corresponding to the tack hole for the rubberized plate is equipped with an inwardly concave semi-circle; the earthed side of the track plate is equipped with the track gear. The utility model is arranged on the carriage wheel of the engineering vehicle by matching, and the utility model can not only keep all kinds of advantages of the wheeled engineering vehicle, but also the engineering vehicle is made to have all kinds of advantages of the track vehicle.