Abstract: To address the challenges of rapid production decline and low recovery in horizontal wells after volumetric fracturing in Niudong volcanic unconventional reservoirs of Tuha Oilfield, this study innovatively proposes a multi-stage diversion re-fracturing technology integrating "subdivided perforation + pre-fracturing energy replenishment + enlarged stimulated reservoir volume", along with precise staged re-fracturing techniques. Systematic research on energy storage mechanisms and reservoir fracability evaluation has optimized key parameters including energy-carrying media, injection volume, diversion stages, and diverter particle size distribution. A comprehensive technical system was established, incorporating well/interval selection criteria, subdivided perforation, pre-fracturing energy injection, full-well multi-stage diversion, and precise staged re-fracturing. Field tests during 2023—2024 on 15 wells in Niudong Block achieved 100% operational success with 86.7% effectiveness, delivering average incremental production of 4.7 t/d per well (cumulative 832 t) and an attractive input-output ratio of 1.18. This successful practice provides a replicable technical template and valuable field experience for enhancing production and recovery in underperforming horizontal wells of Tuha Oilfield’s unconventional reservoirs.