An access terminal box pertaining to the field of communications technologies. The access terminal box includes a protective cover, a base, an adapter, a fastening plate, and a base plate, where the base is fastened on the base plate, the fastening plate is fastened on the base, the protective cover is fastened on the base and covers the fastening plate, a fastening slot is disposed on the fastening plate, and the adapter is fastened inside the fastening slot. The fastening plate is disposed, and the adapter is separately mounted on the fastening plate, such that space of the base is more compact, and a volume of the access terminal box is reduced.