GGB It depends on your structure (mainland through the Abu Dhabi Department of Economic Development versus a free-zone authority), the activities on the licence and your location — so any single figure quoted online is indicative at best. Treat the licence as one line in a much larger opening budget, and confirm the current fee schedule directly with the relevant authority for your case.
From Abu Dhabi Restaurant Licence Cost: Every Fee, Explained — the full reading, with the method behind this answer.