Method for manufacturing a composite fiber component (1) the method comprising the following method steps: forming a moulding core (4) comprising a hollow profile (15) made of segments (16a . . . d) in order to establish an external geometry of the moulding core (4), wherein the segments (16a . . . d) of the moulding core (4) each extend in the direction of the longitudinal axis of the moulding core (4) and are each constructed so as to be pivotable about an axis running in the longitudinal direction of the moulding core (4), between a folded position (A), and an unfolded position (B) of the hollow profile (15) of the moulding core (4), wherein the segments (16a . . . d) are constructed so as to be coupled to one another via connections (18a . . . d, 19a . . . c) in one piece in order to form the hollow profile (15); at least one fiber semifinished product (3) is positioned at least in certain sections on the constructed moulding core (4) in order to shape at least one moulded section (14) of the composite fiber component (1) to be manufactured; and heat and/or pressure is applied to the at least one moulded section (14) in order to manufacture the composite fiber component (1).