The invention belongs to the field of building layer-adding transformation and reinforcement measures, and particularly relates to a shock-absorbing and energy-consumption strengthening connection system of an original building and an additional building. The shock-absorbing and energy-consumption strengthening connection system of the original building and the additional building comprises the original building, the additional building, connecting plates, high-strength energy-consumption connecting steel plates, internal round holes, energy- consumption ribs, lead dot holes, lead dots, binding holes, shape memory alloy wires, shock-absorbing pressure-relief springs, suction disc devices, tension and compression elongation areas, connecting pieces and elastic connecting cables. According to shock-absorbing and energy-consumption strengthening connection system of the original building and the additional building, the original building and the additional building are connected by the connecting plates, the high-strength energy-consumption connection steel plates and the lead dots. The shock-absorbing and energy-consumption strengthening connection system of the original building andthe additional building has the advantages and effects that anti-shock and energy-consumption of the structure are achieved, certain rigidity is achieved, the situation that the original building andthe additional building are subjected to impact damage, drawing damage and the like when the earthquake comes is avoided, the original building and the additional building can work together, and theanti-shock performance and safety of the original building after layer adding are improved.