The invention relates to a backpack, in particular to a rotatable backpack. The rotatable backpack comprises a backboard, an upper box body, a lower box body and a rotary plate, wherein straps are symmetrically arranged on the inner surface of the backboard; the upper box body is fixedly arranged on the outer surface of the backboard; the rotary plate is arranged on the backboard which is on the lower part of the upper box body by virtue of a rotating shaft and a torsional spring; the lower box body is hinged at the end of the rotary plate; the lower box body and the backboard are correspondingly provided with movable fasteners; and the lower box body and the backboard are connected by virtue of the movable fasteners. The rotatable backpack is simple in structure and good in practicability; when the rotatable backpack is used, the lower box body can be rotated to the front of a user, so that a step, before taking articles, of taking off in a conventional backpack is avoided; and meanwhile, the lower box body can additionally rebound through the torsional spring, so as to greatly facilitate the user. The rotatable backpack is especially suitable for home delivery service of small and medium-sized express packages and suitable for outside activities.