FexCoCrAlCu (x=0,0.5,1,2) high entropy alloy coatings are prepared by laser surface alloying on the surface of Q235 steel. The constituent phases, microstructure, chemical composition and microhardness of the laser alloying coatings are analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and microhardness tester respectively. The experimental results show that FexCoCrAlCu/Q235 high entropy alloying coatings with different Fe content form single body-centered cubic (BCC) solid solution. The laser alloying coatings have good metallurgical bonding to the substrate. The solidfied microstructure is the typical dendritic structure with component segregation. The microhardness of the laser alloying coatings is much higher than that of the Q235 steel, and the microhardness of the coatings tends to decrease gradually with the increase of Fe content. From the surface of FexCoCrAlCu/Q235 laser high entropy alloying coatings to the substrate, the mixing entropy presents gradient distribution from high entropy, medium entropy to low entropy.