The invention relates to a sectional wind power generation blade with interchangeability, which is used for solving the problem that a large wind power generation blade is difficult in manufacturing, transportation and installation. The sectional wind power generation blade with the interchangeability comprises a first blade section, a first metal connection component, a second metal connection component, a second blade section and a maintenance cover plate, wherein the first blade section and the first metal connection component are of an integrated structure, the right end of the first metal connection component and the left end of the second metal connection component are assembled in a matching manner, the second metal connection component and the second blade section are of an integrated structure, and the maintenance cover plate is arranged at the assembled position of the first metal connection component and the second metal connection component. According to the sectional wind power generation blade with the interchangeability, the manufacturing difficulty of the large wind power generation blade and the transportation cost are reduced, the assembly efficiency of the sectional wind power generation blade is improved, and meanwhile the maintenance cost of the sectional wind power generation blade is saved.