The invention discloses an aluminum-air battery stack, which comprises a front panel, a thick grating, a grating, an air electrode, a reinforcing grating, a battery outer skeleton, a thick battery outer skeleton, an aluminum electrode, an aluminum electrode holder, a rear cover and an air runner; when a battery works, an electrolyte enters a liquid inlet of the stack through an electrolyte pump; the electrolyte enters various single batteries through liquid inlet runners of the single batteries; and after reaction cavities of the single batteries are fully filled with the electrolyte, the electrolyte flows out of the single batteries from liquid outlet runners, and is recovered through a liquid outlet. Due to a detour design of the liquid inlet runners, a design of a one-way valve and the design of the liquid outlet, the problem of a liquid connection among the single batteries is effectively avoided. Air is blown into an air runner through a fan; and oxygen in the air can be subjected to an electrochemical reaction together with an aluminum electrode after passing through the air electrode, so that electric energy is provided. The aluminum-air battery stack can be connected with a plurality of single batteries in series, so that the battery structure is greatly simplified; and the voltage and the power of the batteries are improved.