The invention relates to the field of molding auxiliary devices, and discloses an autoclaved concrete block separator. The autoclaved concrete block separator comprises an L-shaped rack, a separationmechanism and a supporting part, wherein the rack comprises a transverse end and a vertical end; the supporting part is located on the transverse end; the separation mechanism comprises a pull rod, aconnecting rod, a push handle, an inflator, a flexible rope and a gasbag; the gasbag is flat, is fixed on the transverse end of the rack and is parallel to the transverse end; the pull rod is in slipconnection with the transverse end and is parallel to the transverse end; the inflator is fixed on the transverse end, is parallel to the transverse end and is connected to the gasbag; a piston is arranged in the inflator; one end of the connecting rod is connected to the pull rod, and the other end of the connecting rod is connected to the piston; the push handle is in slip connection with the vertical end; and one end of the flexible rope is connected to the pull rod, and the other end of the flexible rope is connected to the push handle. The autoclaved concrete block separator has the beneficial effects that the autoclaved concrete block separator is convenient for applying force during separation of autoclaved aerated concrete blocks and meanwhile, prevents the autoclaved aerated concrete blocks from being damaged in a separation process.