The invention provides a battery box and a manufacture method thereof. The battery box comprises an upper cover and a lower box body, wherein the upper cover is arranged on the lower box body; the main body structure of the upper cover is made of a continuous fiber reinforced thermoplastic resin composite sheet through hot press molding, the edge splicing structure of the upper cover is made of a discontinuous fiber reinforced thermoplastic resin composite through in-mold continuous injection molding; the main body structure of the lower box body is made of a continuous fiber reinforced thermoplastic resin composite sheet through hot press manufacture, reinforcing rib structures and the edge splicing structure of the lower box body are made of discontinuous fiber reinforced thermoplastic resin composites through in-mold continuous injection molding. The battery box has the advantages of lighter weight, higher strength and stiffness, better shock resistance, high molding and manufacture efficiency and recyclable materials.