The invention relates to a laminated electrical core disassembling device and method. The device includes an electrical core disposing platform used for positioning to-be-disassembled stacked electrical cores, a diaphragm winding mechanism, a positive electrode suction tray transport mechanism and a negative electrode suction tray transport mechanism, wherein the diaphragm winding mechanism include a reel which is arranged above an electrical core disposing platform and rotatable about its own axis, the diaphragm winding mechanism is used for sequentially unfolding diaphragms arranged and folded in the laminated electrical cores in a winding mode, the positive electrode suction tray transport mechanism is reciprocally assembled between the electrical core disposing platform and a positiveelectrode receiving area and is used for absorbing and disassembling positive electrodes on the diaphragms in the diaphragm unfolding process and transporting the positive electrodes to the positive electrode receiving area, the negative electrode suction tray transport mechanism is reciprocally assembled between the electrical core disposing platform and a negative electrode receiving area and isused for absorbing and disassembling negative electrodes on the diaphragms in the diaphragm unfolding process and transporting the negative electrodes to the negative electrode receiving area, and the positive electrode suction tray transport mechanism and the negative electrode suction tray transport mechanism are used for adsorbing the corresponding electrodes by suction tray assemblies.