NOVELTY - The method of producing a semi-finished fiber product (10) for producing a fiber-reinforced component such as a belt of a rotor blade of a wind energy plant, comprises: providing a basic layer (11) with rovings, which do not have 0 degrees orientation in relation to a longitudinal axis of the semi-finished product to be formed, or providing a basic layer configured as a fibrous nonwoven structure; and applying rovings to the basic layer as a second layer (12) with 0 degrees orientation in relation to the longitudinal axis of the semi-finished product.    USE - The method is useful for producing a semi-finished product such as a semi-finished fiber product for producing a fiber-reinforced component such as a belt of a rotor blade of a wind energy plant.    ADVANTAGE - The method ensures economical production of the semi-finished product with increased longitudinal rigidity and stiffness and light weight.    DETAILED DESCRIPTION - The method of producing a semi-finished fiber product (10) for producing a fiber-reinforced component such as a belt of a rotor blade of a wind energy plant, comprises: providing a basic layer (11) with rovings, which do not have 0 degrees orientation in relation to a longitudinal axis of the semi-finished product to be formed, or providing a basic layer configured as a fibrous nonwoven structure; applying rovings to the basic layer as a second layer (12) with 0 degrees orientation in relation to the longitudinal axis of the semi-finished product; distributing staple fibers with a predetermined fiber length as a third layer (13) onto the second layer comprising rovings with 0 degrees orientation; applying rovings with 0 degrees orientation in relation to the longitudinal axis of the semi-finished product as a fourth layer (14) onto the third layer comprising staple fibers; applying a layer of staple fibers having a predetermined fiber length and a layer consisting of rovings with 0 degrees orientation on the fourth layer; and joining the assembled layers to one another by sewing to form the semi-finished product. The rovings of the base layer exhibit an orientation of 90 degrees with respect to the longitudinal axis of the semi-finished product. The steps of applying rovings to the basic layer as the second layer and distributing staple fibers with the predetermined fiber length as the third layer onto the second layer are carried out until the semi-finished product reaches a predetermined basis weight of 0.5-1 kg/m2. The basic layer consists of rovings with 90 degrees orientation comprising a proportion of 5-10% of the total weight of the semi finished product made from the fiber-reinforced material and/or the proportion of the layer formed of staple fibers is 3-5% of the total weight of the semi finished product made from the fiber-reinforced material. The proportion of rovings with 0 degrees alignment is 85-92% of the total weight of the semi finished product. An INDEPENDENT CLAIM is included for a semi-finished product such as a semi-finished fiber product for producing a fiber-reinforced component such as a belt of a rotor blade of a wind energy plant.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic cross-sectional view of a fiber clutch of a fibrous semi finished product of a wind energy plant.    Semi-finished product (10)    Basic layer (11)    Second layer (12)    Third layer (13)    Fourth layer. (14)