In order to better understand the wind load calculation in the transmission line design, the calculation formulas of wind load and the setting of calculation parameters were compared among four different design standards: Technical Code for Designing 110~750 kV Overhead Transmission Line (GB 50545—2010) in China, IEC 60826—2003, ASCE 74—2009 and JEC 127—1979. Moreover, based on the calculation and comparison of wind load in a real 500 kV project, the differences among the calculation results of different standards were analyzed under the same design condition. The results show that the wind load defined in the China’s code is little numerical different from those calculated by other codes, however, some parameters are still worthy of further discussion.