Disclosed is a formation process of a lithium ion battery with lithium nickel cobalt manganese oxide. Through integrated formation equipment integrated by a segmentation variable pressure control system, a temperature control system, a time controlled system and a formation charge and discharge function, the battery is shaped at high temperature and high voltage, formed at high temperature and high voltage with low current and then heavy current, permitted to stand at normal temperature, performed trickle charge, and finally pumped, sealed and divided. The formation process can effectively improve the dense uniformity of the current during the formation and the matching of the temperature and voltage, avoid the polarization and bulging of the battery, generate a stable SEI film, and improve the electrical performance and safety performance of the battery. The formation method integrates the conventional operation process of preforming-standing-recharging to one step on one machine, which shortens the battery formation time and significantly improves the production efficiency.