The present invention provides a variable-pitch blade component, which comprising: blades with multiple blade segments, at least two adjacent blade segments are capable of mutually rotating so as to change its pitch angle; and the variable-pitch guiding structure, comprising the circumferential-extension guide rail fixed to one of the two adjacent blade segments that are capable of mutually rotating, and one or multiple guiding elements fixed to another one of the two adjacent blade segments which are capable of mutually rotating, wherein said one or multiple guiding elements are constructed to be guided and moved on said guide rail.