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The application relates to the technical field of wind power equipment, in particular to a tensioning device of a wind power blade girder. The tensioning device comprises a shape-following mechanism, a supporting assembly and an adjusting mechanism. The shape-following mechanism has a predetermined length and opposite first and second end portions along the length direction of the shape-following mechanism; the supporting assembly and the shape-following mechanism enclose a fixing cavity for accommodating a pultrusion girder, and the supporting assembly comprises a rigid supporting piece and a first connecting piece; in the length direction, one end of the rigid supporting piece is rotationally connected to the first end portion through the first connecting piece, and the other end is detachably arranged with the second end portion to open or close the fixing cavity; the adjusting mechanism is connected with at least one of the shape-following mechanism and the rigid supporting piece and drives the rigid supporting piece to move relative to the shape-following mechanism to adjust the volume of the fixing cavity. The tensioning device can avoid the stacking and mispositioning of pultrusion plates, so that the pultrusion girder is prevented from being damaged.