The invention discloses a battery box. The battery box comprises an outer box body and a box cover, wherein the outer box body comprises a bottom plate and four side walls which stretch upwards from the peripheries of the bottom plate and are arranged in parallel; the inner wall and the outer wall of each side wall are respectively provided with a plurality of supporting strips and heat dissipation strips which are arranged along the plumb line direction; the supporting strips and the heat dissipation strips which are positioned on the same side wall are symmetrically arranged on two surfaces of the same side wall; the supporting strips and the heat dissipation strips on the two side walls which are arranged in parallel are symmetrically arranged; a plug-in mounting space for a side edge of an insulation separating plate to be inserted in is reserved between every two adjacent supporting strips on each side wall; two side edges of the insulation separating plate are respectively inserted in the plug-in mounting spaces which are symmetrically arranged on the two side walls; a hollow containing cavity of the outer box body is divided into a plurality of storage cavities which can be used for containing a plurality of battery packs. The battery box disclosed by the invention has the beneficial effects that effective and flexible partitioning of an inner cavity of the box body of the battery box is realized, the probability that a single battery moves due to vibration is reduced, and efficient heat dissipation is provided.