In the present study, ethyl cellulose microcapsules containing linseed oil were synthesized by the method of solvent evaporation in two stages as the main factors of self-healing properties in self-healing coatings. Characterization of synthesized capsules was performed by Fourier transform infrared spectrometry test. The results showed that linseed oil and fluorescence were successfully loaded into capsules. Distribution of the size and mean of diameter of the microcapsules were analyzed by particle size distribution analysis. The results of this analysis showed that the average of diameter of the microcapsules containing linseed oil was 266.2 nm, and for the microcapsules containing linseed oil and fluorescent was 470 nm. Surveying the morphology of surface of the capsules by using scanning electron microscopy showed that the synthesized capsules have a completely spherical geometry and a relatively flat morphology surface. The synthesized capsules were designed to produce self-healing coating, mixed with polyurethane paint and applied on steel sheets. Also, a sample of non-capsule coating was provided as a reference coating. Self-healing ability and corrosion resistance of coatings after make a scratch on them were evaluated by long-term electrochemical impedance tests and tafel polarization test in 3.5 wt% NaCl solution. The results of the tests showed that the resistance of capsule coatings increased compare to the non-capsule polyurethane coating. The results of the salt spray test to verify the corrosion performance of the coatings as well confirmed the results of the corrosion tests. In order to detect and investigate the resistance to disbonding of coatings under cathodic protection, a cathodic disbonding test for specimens containing and without fluorescent was performed with a primary defect. After 24 hours in the reference coating, the first signs of corrosion were observed and then the disbonding increased and the minimum amount of time, for microscopic samples, increased to 48 and 120 hours, respectively. The results showed that the self-healing polyurethane coating containing microcapsules could be suitable for corrosion applications by applying a cathodic protection system.