The invention relates to a process for improving an environment-friendly hinge base layer composite coating. The process comprises the following step that ultrasonic wave oil removal is carried out, wherein medium temperature oil and wax removal powder is adopted for thoroughly removing oil contamination on the surface of a hinge workpiece, the weight of the oil and wax removal powder is 100 g to 500 g, the temperature is generally 60 DEG C to 80 DEG C, and the time is 2 minutes to 10 minutes. According to the process, nanoscale potassium-free polypropylene electrophoretic paint and an electrophoretic machining process are adopted, the history that dark nickel plating is adopted for a traditional hinge is thoroughly stopped, the hinge base layer bonding force is increased, and the effect of improving the hinge antiseptic property is achieved.