Abstract: The viscosity of high entropy alloys in liquid atomization process has the important influence on the atomization effect. Using the existing ternary alloy viscosity model, a new viscosity model of the CoCrFeMnNi high-entropy alloy melt with equal molar ratio was established through the model expansion in this paper. The influence of temperature on the viscosity of five-element high entropy alloys was studied. The viscosity curves were drawn and modified, and the relationship between temperature and viscosity of high entropy alloys was calculated. In the results, the viscosity decreases from 0.0211 Pa·s to 0.0114 Pa·s when the temperature increases from 1360 K to 2000 K. With the increase of the element content, the viscosity of high entropy alloys increases. Cr has the most significant effect on the alloy viscosity, while Fe and Co have the same effect on the viscosity. The prediction model results of liquid viscosity for five-element high entropy alloys are consistent with the experimental results of thermal state experiment.