Abstract: A lithium battery assembly method includes an assembly system and a positive and negative homopolar explosion-proof lithium battery, wherein an electrode assembly system, a combining system and a sealing system are arranged; guide pins are corrected and hence enter pre-punched holes of a nailing area to achieve nailing; after foil paper is subjected to primary foil pulling, flattening, secondary foil pulling and foiling, tails of the guide pins after ejection are wound, and synchronous lamination, paper cutting, gumming and output are performed; an aluminum shell is fixedly connected with the positioned guide pins and forced by program control to form a battery body structure; the battery body structure is sleeved into a tubular gel according to the setting scale of a control device; and the displacement and the moving cycle are calibrated by a servo control system, so as to control a sealing machine to achieve port sealing.