The invention discloses a cylindrical battery module, which comprises an initial battery pack, an upper cover plate, a lower cover plate and a plurality of binding belts, wherein the initial battery pack is arranged between the upper cover plate and the lower cover plate; and the plurality of binding belts are wound outside the upper cover plate and the lower cover plate, and enable the upper cover plate and the lower cover plate to tightly clamp the initial battery pack. The cylindrical battery module has the advantages that the integration of the battery module is simply realized through structures of the binding belts, the upper and lower cover plates and the like; and the side surface of the initial battery pack is not sealed, so that the heat radiation effect of the battery module is good.