The invention relates to a method for improving the magnetic powder detection sensitivity of a yoke method. The method comprises the following steps: (1) preparing special magnetic conductive adhesive according to a proportion; (2) calculating the theoretical size and the actual size of a magnetic boot according to the size and the shape of a detected curved surface workpiece and the size of a magnetic pole; (3) manufacturing a papery solidifying mould by using a thin paper board according to the shape of the curved surface of the detected workpiece; (4) completing the solidification of the magnetic boot; (5) implementing detection. According to the method for improving the magnetic powder detection sensitivity of the yoke method, the effective contact area between the curved surface workpiece and the magnetic pole is increased and the surface roughness of a contact part is compensated by solidifying an elastic magnetic conductive boot at the tail end of the magnetic pole of a yoke, so that the magnetic resistance is reduced and the magnetic flux is increased; therefore, the detection sensitivity is improved. The method has the advantages of low cost and easiness in operation.