Abstract: The AlCoCrFeNi high-entropy alloy coatings (HEAC) were prepared on 45 steel substrate by numerical control high energy micro arc spark deposition process with parametric equidistance spot-welding pattern deposition strategy. The surface morphology and phase composition of the coating were investigated by SEM and XRD. By taking layer number as variable, the consumption law of electrode length and the mass transfer of electrode/substrate were studied. The consumption curve, anode mass loss curve, and cathode mass gain were fitted using Bézier curve. The electrode length consumption law and mass transfer law lay foundations for the continuous deposition and the precise control of the microstructure of multi-layer AlCoCrFeNi HEAC. The numerical control high energy micro arc spark deposition process provides a new coating preparation method for functional coatings.