With　the　development　of　the　mobile　Internet,　supporting　multi-user　has　become　a　popular　concern　for　Internet-based　algorithms.　In　this　paper,　an　efficient　watermark　embedding　framework　is　proposed　to　achieve　secure　outsourced　image　watermarking　in　multi-user　settings.　In　addition,　an　authentication　mechanism　for　authorized　users　is　designed　to　ensure　the　security　and　correctness　of　the　information.　The　proposed　method　enables　watermarking　operations　in　complex　outsourced　environments　while　embedding　watermarks　in　encrypted　images　of　multiple　users.　The　experimental　results　show　that　the　framework　is　feasible　and　scalable.　©　2022　IEEE.