A high-performance composite lubricant combining diamond-like carbon (DLC) films and customized grease was developed to address the rapid wear of DLC used as solid lubricants. Under contact stresses of 2.19–3.47   GPa, the composite reduced wear by 97.5%, achieving 1.10×10 -8 mm 3·N -1·m -1 after 288,000 cycles at 2.19   GPa. Using a DLC film with a dual transition layer enhanced adhesion and tribological performance. The composite forms a stable friction transfer oil film, while nano-additives in the grease further improve lubrication. This solid–liquid system offers low wear, long service life, and reduced maintenance frequency, demonstrating strong potential for wind turbine bearing applications.