Lithium recovery method

Provided is a lithium recovery method capable of recovering lithium with high purity from a liquid to be treated in which lithium and an inorganic salt are dissolved. This lithium recovery method comprises: a concentration step (S8) for evaporating and concentrating a liquid to be treated in which at least lithium and an inorganic salt are dissolved; a crystallization step (S9) in which the liquid to be treated after the concentration step (S8) is cooled and crystallized, and inorganic salts are precipitated in the form of crystals; a solid-liquid separation step (S10) in which a precipitate containing inorganic salt crystals is separated from the liquid to be treated after the crystallization step (S9); a carbonation step (S11) in which, after the solid-liquid separation step, carbon dioxide is mixed and/or a water-soluble carbonate is added to the liquid to be treated in (S10); and a solid-liquid separation step (S12) for separating, from the liquid to be treated, a precipitate containing lithium carbonate