Disclosed is a wind-cup type fiber wind speed detector, comprising a laser as well as a fiber coupler and a wind-velocity indicator probe which are optically connected with the laser. The fiber coupler is also optically connected with a photoelectric detector, with the photoelectric detector being electrically connected with a signal processing circuit. The wind-velocity indicator probe comprises a rotating shaft as well as a wind cup and a code disc which are jointly arranged upon the rotating shaft, wherein the edge close to the code disc is evenly provided with a loop of light through holes; the centers of all the light through holes are located at the concentric circles taking the axle center of the rotating shaft as the center of circle; and the upper and lower sides of the code disc are provided with a fiber collimator and a corresponding reflector, with the light emitted by the collimator being vertical to the plane where the concentric circles are located and intersecting with the circumference of the concentric circles.