Abstract: An apparatus for preparing lithium sulfide includes a reaction chamber that has a reaction space for generating lithium sulfide and is provided to move a supplied lithium raw material in a predetermined direction; a lithium raw material supply unit provided to continuously supply the lithium raw material to an upstream side of the reaction chamber in the predetermined direction; a hydrogen sulfide supply unit provided to supply hydrogen sulfide to the reaction chamber; a heating unit; a lithium sulfide recovery unit provided on a downstream side of the reaction chamber in the predetermined direction and provided to recover lithium sulfide that is generated by a reaction between the hydrogen sulfide and the lithium raw material in the reaction chamber; an inert gas supply unit provided to supply an inert gas to the upstream side of the reaction chamber in the predetermined direction; and a moisture removal unit.