Main beam for fan blade and manufacturing method therefor

A main beam (100) for a fan blade, comprising: one or more carbon fiber pultruded bodies (101), wherein each carbon fiber pultruded body (101) comprises one or more carbon fiber pultruded plates (101a), which are stacked in the thickness direction and formed by solidifying a first pouring material, wherein a glass fiber pouring material is arranged between every two carbon fiber pultruded plates (101a); one or more inserts (102) arranged adjacent to the carbon fiber pultruded bodies (101) in a direction perpendicular to the thickness direction of the main beam (100); one or more covering layers (103) that cover the carbon fiber pultruded bodies (101) and/or the inserts (102) on both sides in the thickness direction of the main beam (100); and a second pouring material (101b) that infiltrates the carbon fiber pultruded bodies (101), the inserts (102) and the covering layers (103). By means of the main beam, various properties of the blade such as rigidity can be adjusted while the consumption of carbon fibers are reduced, and the adherence of the main beam to a curved mold is improved and the defects of bubbles and wrinkles etc. are reduced, thus increasing the required rigidity of the main beam and prolonging the service life of the main beam. Further disclosed are a method for manufacturing the main beam and a wind driven generator comprising the main beam.