An access terminal box includes a protective cover, a base, and a base plate, where the protective cover includes a cover plate and side walls that are disposed around the cover plate, the cover plate and the side walls form an open-mouthed box structure, the base is fastened inside the open-mouthed box structure of the protective cover by using a first detachable structure, the base is fastened to the base plate by using a second detachable structure. In embodiments of the present invention, when the base is to be detached from the base plate, it is not required to first detach the protective cover; therefore, a fiber coiled on the base can be better protected, damage to the fiber can be avoided, and it is suitable for non-professional personnel to detach the access terminal box.