The present invention relates to a lamination device for manufacturing a secondary battery, and provides a lamination device for manufacturing a secondary battery, comprising: an introducing unit for introducing an electrode assembly having a web structure in which a cathode and an anode are correspondingly joined, with a separation film therebetween; a heating unit for inducing thermal bonding between the cathode/separation film/anode by heating the electrode assembly; a discharge unit for discharging the thermally bonded electrode assembly, wherein the electrode assembly is transferred via the introducing unit, the heating unit and the discharge unit; and a pressing unit arranged between the heating unit and the discharge unit, and having a press roll for joining the electrode assembly by upward/downward pressing, and thus the separation film is uniformly distributed between the cathode and the anode without deviation so as to minimize defects in which the cathode and the anode come in contact with each other, and thus an effect of preventing, in advance, fire/explosion accidents caused by shorting is expected.