The invention discloses a battery piece laminating apparatus. The battery piece laminating apparatus comprises a diaphragm supplying apparatus, a laminating apparatus, two battery piece positioning apparatuses, a swing mechanism and a bottom plate, wherein the two battery piece positioning apparatuses are fixed on the two sides of the bottom plate respectively; the swing mechanism is arranged in the middle of the two battery piece positioning apparatuses, and swings by taking the center axis of the swing mechanism as a swing shaft; the laminating apparatus obtains battery positive plates and battery negative plates from the two battery piece positioning apparatuses respectively; and diaphragms are driven by the laminating apparatus and constantly cover the surfaces of the battery positive plates and battery negative plates obtained in each time to form continuously and repeated Z shape and to separate the obtained battery positive plates and battery negative plates so as to form a battery laminated piece. The invention also discloses a battery piece laminating method by adopting the battery piece laminating apparatus. The battery piece laminating apparatus is compact in structure, capable of greatly improving the laminating speed and efficiency by virtue of the way of obtaining the battery positive plates and battery negative plates in a swing manner, high in stability, and high in repeat precision.