The invention discloses a coacervation technology for polymer product production, and concretely relates to an energy-saving and consumption reduction process, process conditions and operation modes of the coacervation technology for polymer product production. The coacervation technology for polymer product production is especially suitable for a styrene-butadiene-styrene block copolymer (SBS) production device. The coacervation technology for polymer product production combines a three-reactor differential pressure coacervation technology and a rubber particle coacervation technology, and thus the coacervation technology for polymer product production is a novel, energy-saving and low-energy consumption SBS coacervation technology, can effectively alleviate a contradiction between energy saving and consumption reduction, can reduce solvent consumption and a steam use amount, and can be utilized for a SBS production device of the Yanshan petrochemical company.