Segmented fan blade as well as preparation and assembly method of segmented fan blade

The invention discloses a segmented fan blade, which comprises a fan blade back edge segment (1) and a fan blade body segment (2), wherein the fan blade back edge segment (1) comprises an upper casing (1-1), a lower casing (1-2) and an auxiliary pasting corner (1-3), the auxiliary pasting corner (1-3) for connecting the upper casing (1-1) with the lower casing (1-2), the upper casing (1-1) and the lower casing (1-2) consist of skins (1-4), core materials (1-5) and auxiliary beams (1-6), the fan blade body segment comprises a body segment upper casing (2-1), a body segment lower casing (2-2) and a rib plate (2-3), the body segment upper casing (2-1) and the body segment lower casing (2-2) are formed by a crossbeam (2-4) and a sandwich structure (2-4), and the rib plate (2-3) is formed by the sandwich structure (2-4). The segmented fan blade provided by the invention has the advantages that the structural design is reasonable, the mechanical intensity is high, the segmented fan blade design is adopted, the prob