Due to its unique self-renewal and multi-directional differentiation capabilities, mesenchymal stem cells (MSCs) have become an emerging therapy that replaces of ineffective conventional options in treating multiple diseases. It plays an important role in ocular surface illnesses through a variety of functions, including immunoregulation, promoting repairing, anti-angiogenesis mechanisms, and cell replacement. MSCs from different sources have different mechanisms.So far, 8 registered clinical trials of MSCs therapy have been applied to treat dry eye, ocular burn, keratoconus and other ocular surface diseases.