Abstract: Castor oil was modified by grafting aggregation induced emission fluorescent monomer (TPE-COOH) and then was used to prepare water-based fluorescent silicate polymer coatings. The effects of content of TPE-COOH and modified castor oil on the surface morphology, mechanical properties, fluorescence property and antifouling property of the coatings were studied. The results show that the surface of water-based fluorescent silicate polymer coating was smooth and uniform. With increasing content of TPE-COOH modified castor oil, the adhesion and the maximum fluorescence intensity of the coating increased, and the hardness decreased. The content of the TPE-COOH had no significant effect on the mechanical properties of the coating. Compared with those of the unmodified silicate polymer coating, the adhesion and antifouling effect of the water-based fluorescent silicate polymer coating were improved. When the mass ratio between castor oil modified by TPE-COOH, silicate slurry and curing agent was 1:10:5.5, the coating had good comprehensive mechanical properties and antifouling properties.