In order to improve the transmission characteristics of fiber-optic communication, a new air-hole arrangement structure ring photonic crystal fiber is designed, which has a large-diameter air-hole as the core, and the cladding is made of SiO₂ as the base material, containing three layers of air-holes in the form of a rectangular, circular, and ring-cut-sector polygon. The transmission characteristics of photon orbital angular momentum modes in the designed fiber are analyzed based on the finite element method. The results show that the stable transmission of 118 OAM modes can be achieved in the high refractive index ring around the fiber core in the C+L band without the existence of radial higher-order modes, the maximum effective mode field area are 305.3 μm², which obtained in 1.63 μm, which effectively increases its communication capacity, and the minimum effective refractive index difference between its neighboring vectorial modes is 5.43×10^-3, the maximum confinement loss is 1.06×10^-8 dB/m, the minimum nonlinear coefficient is 0.285 w^-1 ·km^-1, and the minimum dispersion of the vectorial modes is 2.68 ps/(km·nm), and the quality of intrinsic modes are all between 95.56%~98.37%, which could increase the quality of communication. This photonic crystal fiber can be applied to mode division multiplexing system, which provides a reference for improving the communication transmission efficiency.