The invention discloses a fractional-slot three-phase single-layer sine winding of an intermediate-frequency generator. The winding has 36 slots of stator cores, 16 poles and 3 phases and is a fractional-slot winding, the generator has the rotating speed of 3000 r/min and the frequency of 400Hz, the number q of slots per pole and per phase is equal to 3/4, and the stator cores incline by 0.9 stator pitch, weaken fundamental harmonics a little, but enable fifth harmonics to be zero and greatly weakens thirteenth harmonics and seventeenth harmonics. The invention has the technical effects that the three-phase winding is connected to form a three-phase star-shaped three-wire system to supply power to the outside, and no third harmonics and harmonics which are odd times of three exist in the line voltage, therefore, the harmonic content of the line voltage of the fractional-slot three-phase single-layer sine winding is very small, the sinusoidal waveform distortion rate of idle-load line voltage is 0.617% and is smaller than 1%, and the fractional-slot three-phase single-layer sine winding achieves the high sine property, is simple in process, easy to implement and great in generalization and application significance.