The generation of vortex light in the fiber has an important application value in improving the performance and reducing the cost of orbital angular momentum communication system. Few-mode fiber is a kind of optical fiber with fundamental mode and low order modes. According to the coupling mode theory and the generation principle of vortex light, the effect of the incident angle on the excitation efficiency of the first order mode in the few-mode fiber is simulated. The first order modes of TM01, TE01 and HEeven21 are generated in the few-mode fiber, and the first order vector beams with HEeven21 and HEodd21 modes are superimposed to produce vortex light. The results of polarization detection and triangular diffraction show that the vortex light produced by the few-mode fiber is circularly polarized light and the topological charge (l) is 1. The use of few-mode fiber in the experiment provides a simple and low-cost method for the producing of vortex light.