The invention relates to a novel waste power battery full-automatic dismantling device including: 1, a loading mechanism, 2, a loading conveyer, 3, a four-station material poking mechanism, 4, material distribution conveyers, 5, cutting devices, 6, separation feeding mechanisms, 7, separators, 8, outer shell storage boxes, and 9, electric core storage boxes. Along the power battery heading direction, the loading mechanism, the loading conveyer, the four-station material poking mechanism, the material distribution conveyers, the cutting devices, the separation feeding mechanisms and the separators are successively arranged; the outer shell storage boxes and the electric core storage boxes are respectively connected with the separators. The invention also relates to a novel waste power battery full-automatic dismantling method. The device has the advantages of simple structure and high dismantling efficiency, adopts a battery mechanical dismantling way integrating electrode head end one-time cutting and electric core clipping-out, and belongs to the power battery recycling processing field.