The invention discloses a photonic crystal fiber. The fiber comprises a core layer, a covering layer and a coating layer from the interior to the exterior. The cross section of the fiber is circular.The core layer, the covering layer and the coating layer are concentric. The core layer is arranged in the innermost layer. A circular hole is arranged in the center of the cross section of the core layer. Multiple elliptic air holes are uniformly arranged in the covering layer. The covering layer comprises 5 covering layer rings. The air holes in each covering layer ring are arranged in an annular array manner by taking the center of the core layer as the center original point. The size of the area of the cross sections of the air holes in the covering layer rings are successively increased from the inner ring to the outer ring. Long shafts of the elliptic air holes point to the center of the core layer. The intervals between the covering layer rings are successively increased from the inner ring to the outer ring. The core layer and the covering layer are made of silicon dioxide crystals or silicon crystals. The coating layer is made of acrylic ester or silicone rubber. According tothe invention, multiple orbital angular momentum modes can be transmitted; the effective refractivity reach 10-3 orders; the confinement loss is low; the nonlinear coefficient is small; and the chromatic dispersion is low.