In 2014 and 2015, the Research Center for Chinese Frontier Archaeology at Jilin University and the Jilin Province Archaeological Research Institute jointly conducted two excavations at the Yinjiawopu Site, in Da’an City, Jilin Province, Northeast China. One burial, two canals, five leaching pits, two house-foundations, four hearths, 103 pits, two ditches, and over 800 pieces of artifacts dated from the 12th to the 13th centuries A.D. (the Liao-Jin period) were found. Analysis shows that these features belong to a salt production workshop. This study marks the first discovery of a salt production site in Northeast China. The archaeological, ethnographic, and historical materials from the site allow a reconstruction of the chaîne opératoire of salt-making by the inhabitants of the Northeast China Plain during this period. This study sheds light on the exchange and control of salt, on the activities and daily life of the inhabitants of the region, and on their relationship with the environment.