The invention discloses a fan-shaped sun-shading blind which comprises a motor, a coupler, a speed reducer, a plurality of laminated blinds, a transmission shaft, a reinforcing plate, a bracket welding piece and an arched track; the bracket welding piece is used for supporting the blinds, the transmission shaft and the motor; the arched track is used for guiding the direction of the blinds; the bracket welding piece is fixedly connected with the arched track; one end of the transmission shaft is connected with the speed reducer; the other end of the transmission shaft is connected with the reinforcing plate through a key; the reinforcing plate is fixedly connected with the main blind; two sides of each blind are provided with a full-length positive folding side and a full-length reverse folding side respectively along the length direction to form an S-shaped cross section; one end part of each blind is provided with a shaft hole passing through the transmission shaft; and two adjacent blinds are linked in a pothook form through the positive and the reverse folding sides. The fan-shaped sun-shading blind is suitable for a special building shape of which the cross section is made to be similar to a fan shape, has good sun-shading effect, can adjust light, is perfectly combined with the building, has integrated attractive appearance, reaches the integration of the sun shading and the building and enriches the building elevation to allow the building to be more interesting and artistic.