The invention discloses a photonic crystal fiber. The photonic crystal fiber is characterized by comprising a core layer, a cladding layer and a coating layer from inside to outside, wherein the crosssection of the fiber is circular, the core layer, the cladding layer and the coating layer are concentric, the core layer is the inner-most layer of the fiber, the center of the cross section of thecore layer has a circular hole, the cladding layer is internally provided with multiple fan-shaped ring air holes uniformly, the cladding layer comprises four cladding rings, each cladding ring has same-size fan-shaped ring air holes, the air holes are sequentially adjacent, the sizes of the fan-shaped ring air holes of in the cladding rings gradually increase from inside to outside, intervals ofthe cladding rings are the same, the coating layer is the outer-most layer, the core layer and the cladding layer are respectively prepared from silica crystal or silicon crystal, and the coating layer is prepared from acrylate or silicone resin. The photonic crystal fiber is advantaged in that multiple orbital angular momentum modes can be transmitted, effective refractive index difference of the mode group reaches 10-3 magnitude, limit loss is low, a nonlinear coefficient is small, and dispersion is low.