Abstract: It is an effective way to improve the accident tolerant capability of fuel cladding tube to prepare a reinforced coating on the surface of zirconium alloy. Laser cladding technology is one of the most commonly used methods to prepare high entropy alloy coatings. In this paper, high speed laser cladding technology with little influence on substrate heat was used to successfully prepare Al_0.2CrFeNiCu_1.5 high entropy alloy coating on zirconium alloy rods with good metallurgical bonding to substrate and no defects such as cracks and pores. The microstructure of the surface and cross section of the coating was observed and analyzed by scanning electron microscope, the cross section hardness of the coating was studied by micro-Vickers hardness tester, and the corrosion resistance of the coating in 3.5% NaCl solution was studied by electrochemical workstation. The results show that there is mutual diffusion of elements between the bottom of the coating and the substrate, the heat affected zone of the substrate is small, about 86 μm wide, and vertical columnar crystals can be observed at the interface. Heat dissipation is faster at the joint of the bottom of the coating and the substrate, the temperature gradient is large, and the value of G/R gradually decreases from the bottom to the top of the coating, so that the columnar crystal gradually changes to the equiaxed crystal. The coating is composed of gray-black dendrite region and gray-white interdendritic region, in which Fe and Cr elements are enriched in the dendritic region, Al and Ni elements are enriched in the interdendritic region, and Cu elements are enriched at the interface between the dendrites and dendrites. The cross section hardness of the coating is less different, up to 690 HV, about 1.53 times that of the substrate. The main reasons for the high hardness of high entropy alloys are solution strengthening, lattice distortion and slow diffusion. The coating has a wide passivation film, the self-corrosion potential is about −0.508 V, and the positive shift is about 1.723 V compared with the substrate. The self-corrosion current density is 6.241×10⁻⁸ A/cm², two orders of magnitude lower than the zirconium alloy, and the polarization resistance is 1.181×10⁶ Ω/cm², two orders of magnitude higher than the zirconium alloy. At the same time, the coating shows the characteristics of capacitance loop, the arc radius of capacitive reactance is large, the phase angle is about 86°, and the impedance of the coating is 2.326×10⁶ Ω/cm², which is an order of magnitude higher than the zirconium alloy. Al_0.2CrFeNiCu_1.5 high entropy alloy coating improves the corrosion resistance of zirconium alloy.