The invention discloses a formation method of segmented blades for wind power generation. The formation method comprises the following steps of: firstly manufacturing positioning tools for forming thesegmented blades; secondly making blade molds have the conditions for manufacturing the segmented blades by installing and debugging the positioning tools; subsequently manufacturing blade tip sections and blade root section connecting parts of the segmented blades, and guaranteeing the precision of hole alignment in subsequent assembly by virtue of the debugged tools; and finally sequentially dismounting the positioning tools and sequentially installing the positioning tools so as to manufacture the segmented blades on the blade molds. The formation method disclosed by the invention can effectively guarantee the accuracy and reliability of manufacturing of the segmented blades for wind power generation on the blade molds.