The invention relates to the technical field of aerated brick manufacturing, in particular to an aerated brick cutting machine. The aerated brick cutting machine comprises a machine frame and a vertical cutting mechanism arranged in the machine frame. The aerated brick cutting machine further comprises a hydraulic oil cylinder, a first chain, a second chain, a third chain, a fourth chain, a first rotating shaft, a second rotating shaft and a transversely-moving shaft. The aerated brick cutting machine is simple in structure, the vertical cutting mechanism can be vertically lifted in the mode that the chains and the cylinder are combined, it is ensured that the whole vertical cutting mechanism is vertically synchronous, and the uneven cutting phenomenon is avoided; through the synchronous swinging of a left rotating shaft and a right rotating shaft which are synchronously connected, the steel wire cutting stability is improved, steel wires evenly bear force, the tensioning force is uniform, the steel wires are not prone to getting loose, the fracture phenomenon is not prone to happening in the work process, the stability of the working process of the steam-cured aerated brick transverse cutting machine is ensured, and the work efficiency is greatly improved.