The invention discloses a tungsten-titanium co-doped diamond (DLC) coating material and a preparation technique thereof, which are characterized by: firstly, removing a pollution layer on the surface of a workpiece by ultrasonic cleaning, and performing argon-ion etching cleaning on the surface of the workpiece by glow discharge to obtain an atomic-scale clean surface; secondly, preparing a gradient transition layer by a reactive magnetron sputtering sedimentation method; and finally, preparing a preparing a DLC coating on the transition layer by magnetron sputtering and glow discharge plasma chemical vapor deposition method, wherein the synthesized DLC coating contains carbon element, tungsten element, titanium element and the like; the tungsten content is 2 to 5 percent; and the titanium content is 0.1 to 2.0 percent. The tungsten-titanium co-doped diamond (DLC) coating material is excellent in membrane / base binding force and low in friction coefficient and wear rate.