Producing method for girder of wind power turbine blade and girder of wind power turbine blade

A method for manufacturing a girder of a wind power turbine blade according to the present invention comprises: a material block formation step (S10) of stacking a plurality of material sheets (1) in a row in a height direction to form a plurality of material blocks (10); a material layer formation step (S20) of arranging and connecting the material blocks (10) in a row in a length direction to form a plurality of material layers (100); a material layer stacking step (S30) of stacking the material layers (100) in a row in the height direction; and a wind power turbine blade′s girder formation step (S40) of impregnating the space between the material layers (100) with resins, respectively, to form a girder (1000) of a wind power turbine blade. The girder (1000) of the wind power turbine blade according to the present invention is formed by forming the material blocks (10) with the material sheets (1) stacked in the row in the height direction, forming the material layers (100) with the material blocks (10) arranged and connected in the row in the length direction, stacking the material layers (100) in the row in the height direction, and impregnating the space between the material layers (100) with resins.