The invention discloses a method for recycling an
electrolyte of an aluminum-air battery. The method comprises the steps of: diluting a failed
electrolyte, performing cooling, standing and layering, collecting a lower-layer precipitate, adding one or more than one seed crystals into the lower-layer precipitate for
crystallization to promote most of dissolved aluminum to precipitate, performing centrifuging,
drying, firing to obtain
alumina, and electrolyzing the
alumina to obtain pure aluminum, wherein the separated supernatant can be added with an
electrolyte for repeated use. The invention also discloses an aluminum-air battery with the novel electrolyte prepared by the method. Compared with the prior art, the method can effectively remove the aluminum
hydroxide precipitate and most of dissolved aluminum in the electrolyte, and does not introduce
impurity phases, so that the centrifuged solution can be used as the electrolyte again after the electrolyte is added, and the
resource utilization rate is improved. The method is safe, effective, easy to operate, capable of being performed in a fully-closed environment, capable of purifying the
working environment, capable of effectively avoiding environmental
pollution, low in requirement on equipment and suitable for large-scale industrialization.