Abstract: Al_1.5CrFeCoCu_<i>xNi (x=0, 0.2, 0.4, 0.6, molar ratio) high entropy alloy coatings were prepared on the surface of 45 steel by argon arc cladding. The microstructure and properties of the coatings were studied. The results show that the Al_1.5CrFeCoCu_<i>xNi high entropy alloy coating with copper addition mainly consisted of body-centered cubic phase and face-centered cubic phase. With the increase of the copper content, the content of face-centered cubic phase in the coating increased, and the face-centered cubic phase changed from grain boundary distribution to intergranular particle distribution. With the increase of the copper content, the microhardness of the coating decreased, and the amount of wear decreased first and then increased, and the wear mechanism changed from abrasive wear to abrasive wear+mild adhesive wear. The Al_1.5CrFeCoCu_0.2Ni high entropy alloy coating had high microhardness, low friction coefficient, the minimum wear amount and the best wear resistance.