The furnace wall cooling surface and super heater tube of waste incineration power generation boiler are strongly corroded by high temperature chlorine. In view of the excellent high temperature oxidation resistance of high entropy alloy, the high temperature chlorine corrosion resistance of FeCoCrNiAlTix (x=0, 0.4, 0.8, 1.2, 1.6) high entropy alloy coating was studied. In terms of the method, the FeCoCrNiAlTix high entropy alloy coating was prepared by high-velocity-oxygen-fuel spraying on the Q235 substrate, and the effect of Ti content on the morphology and structure of the coating was studied by scanning electron microscope and X-ray diffractometer, the thermal shock resistance and high temperature chlorine corrosion resistance of the coating were tested. The results show that the high entropy alloy coating presents a typical layered structure. With the increase of Ti content, the porosity of the coating decreases continously. The highest density of the coating is obtained when Ti content is FeCoCrNiAlTi1.2, while the porosity is only 0.46%. The high entropy alloy coating without Ti is composed of FCC phase and BCC phase; with the increase of Ti content, the FCC phase decreases gradually and the coating structure is mainly composed of BCC phase. High entropy alloy coatings have good thermal shock resistance in cyclic thermal shock tests from 800 ℃ to room temperature. Furthermore, the high entropy alloy coatings have remarkable resistance to high temperature chlorine corrosion in high temperature molten salt environment, and the relationship between the mass change of the coatings and time is satisfied with the power function. Comprehensive analysis shows that the addition of an appropriate amount of Ti can improve the forming quality of FeCoCrNiAlTix coating and reduce the porosity of the coating. Among them, the porosity of FeCoCrNiAlTi1.2 coating is the lowest, and the thermal shock resistance as well as high temperature chlorine corrosion resistance are the best.