The present invention relates to a secondary battery laminating device, the secondary battery laminating device for bonding an electrode assembly and a separation membrane according to the present invention comprising: a transfer part for transferring the electrode assembly in a state of being disposed on the separation membrane; and a bonding part disposed on the transfer path of the transfer part for bonding the electrode assembly on the separation membrane by coming into contact with the entire surface of the electrode assembly and applying heat to same. Accordingly, pressure is evenly applied to the electrode assembly enabling the firm bonding of same to the separation membrane, thereby providing a secondary battery laminating device which may produce a secondary battery having excellent durability.