The technology of the tanning process in fur production and the chemical substances used during the tanning process have been studied. A new interpolycomplex tanning agent has been synthesized, taking into account the properties of the chemical substances used in the tanning process. General information about the nutria (Myocastor coypus) animal is provided. During the research, a tanning technology using local tanning agents, instead of imported chemicals, has been developed. The interaction of various tanning agents with nutria leather collagen was studied, and IR spectroscopic analysis results were provided. Based on these results, interpolycomplex treatments were applied to nutria skins in different ratios. For comparison of experimental results, two standard nutria raw leather samples of the same II grade were selected. These skins were processed using both traditional tanning methods and interpolycomplex-based tanning technology, and the results were compared. The effect of the tanning process using the traditional method and the interpolycomplex-based method on nutria skins was studied, revealing that the experimental samples exhibited higher hydrothermal destruction temperature, strength limit, and elongation at break compared to the control sample. The amounts of mineral substances, fats, and moisture in the tanned nutria fur samples were determined, and their compliance with state standards was confirmed. Based on the experimental results, it was concluded that the chemical materials with interpolycomplex tanning agents react actively with collagen, forming strong bonds in the treated furs.