A recyclable plastic composite wheel rim fabrication method includes the steps of: (a) preparing a triaxle or biaxle composite fabric, (b) coating the composite fabric with a layer of plastic material to form a composite substrate, (c) processing the composite substrate into a composite plate member by means of roller pressing, dipping, bake-drying and cutting, (d) stamping the composite plate member into a blank wheel rim by means of a hot press, (e) cooling the blank wheel rim and trimming it to remove to remove blurs and defective selvedge, and (f) polishing the surface of the blank wheel rim to obtain a finished wheel rim.