Hose outer wall protection device

A hose outer wall protection device is bound on the outer wall surface of a hose circularly. The device comprises a first binding part and a second binding part which are made of nonmetallic materials. Each of the first binding part and the second binding part comprises a half-notch structure. A location portion protrudes form one end of each half-notch structure, a snap head is arranged on the location portion, an insertion portion extends from the front end of each snap head, a location hole is formed in the other end of each half-notch structure, which is concave, and the location holes extend towards the insides of the half-notch structures to form location spaces. By means of the device, the first binding part and the second binding part are arranged correspondingly, so that when the location portion of the first binding part is inserted in the location hole of the second binding part correspondingly and the location portion of the second binding part is inserted in the location hole of the first binding part correspondingly, the half-notch structure of the first binding part and the half-notch structure of the second binding part form a sealed space to be snapped on the outer wall surface of the hose to protect the hose outer wall.