The invention discloses a lithium making device, which relates to a chemical engineering device, in particular to a lithium making device-lithium reactor. The invention provides a lithium making device, which comprises a cylinder body, a current leading-in component, a current leading-out component, a graphite electrode and a collector, wherein the current leading-in component is fixedly arranged on the lower part of the cylinder body and is insulated from the cylinder body, and the current leading-out component penetrates the middle part of the cylinder body and is also insulated from the cylinder body; and the current leading-out component arranged in the cylinder body is provided with a central through hole. The graphite electrode is arranged in the cylinder body and penetrates the through hole of the current leading-out component; moreover, the lower end of the graphite electrode is fixedly connected with the current leading-out component. The collector is fixedly connected with the inner wall of the upper cavity of the cylinder body and is divided into an inner cavity and an outer cavity in the radial direction; in addition, the two cavities are communicated with the inner cavity of the cylinder body on the lower part of the collector respectively. The upper part of a middle cavity is provided with a gas outlet, and the upper part of an outer cavity is provided with a liquid inlet and a liquid outlet. The lithium making device has the advantages of reasonable structural design, simple process and good maneuverability; and metal lithium products made by the device have the advantages of high product purity and low cost.