The produced fluids from the Mabei shale oil reservoir of the Xinjiang oilfield is characterized by high salinity and strong emulsion stability，leading to a series of challenges in thermal-chemical sedimentation and electrical dehydration processes，such as high demulsification temperature，low dehydration efficiency，high energy consumption，and unstable operations of electrical dehydration. Accordingly，this study focuses on the produced fluids from the Mabei shale oil reservoir and performs molecular dynamics simulations and laboratory-scale hydrocyclone-electrostatic coupled dehydration experiments to elucidate the mechanisms underlying their high emulsion stability and to explore effective demulsification methods. Molecular dynamics simulation results indicate that resins，asphaltenes，silicon compounds，and high-salinity salts form a rigid interfacial film at the oil-water interface through hydrogen bonding and polar interactions. This film，exhibiting high mechanical strength and significantly hindering droplet coalescence，is fundamental driver for the high stability of produced fluids. Based on these findings，laboratory experiments integrating hydrocyclone pretreatment with electrochemical dehydration are conducted. This coupling process can fully utilize the pre-demulsification effect of the swirling flow field. The results demonstrate that at 70 ℃ and a demulsifier concentration of 200 mg/L，the water content in the produced fluid is reduced to below 0.1% after hydrocyclone pretreatment and electrochemical dehydration，meeting the requirements for deep dehydration. This study provides a theoretical foundation and technical reference for the development of low-energy-consumption，high-efficiency dehydration technologies for Mabei shale oil.