The invention provides a high-range fire hydrant nozzle design method and relates to fire hydrants. A three-dimensional model is designed, and a nozzle is simplified by means of a CATIA; mesh generation is conducted on an entity by means of ANSYS; drawn meshes are analyzed through FLUENT, and images are processed by means of Tecplot software after data is obtained. An original linear contraction section nozzle is improved into the bi-cubic curve nozzle, gas-wall separation generated when fluid flows through the nozzle is reduced by utilizing the principle and method in wind tunnel design, pressure loss in the fluid flowing process is greatly reduced, accordingly water columns sprayed by a fire hydrant can be farther, and the range problem of the fire hydrant is solved.