A fast channel allocation method in wireless ultraviolet network based on particle swarm is adopted aiming at the characteristic of non-line-of-sight and channel interference model. Fully considering the influence of conflict matrix caused by the space angle, a directional and fast channel allocation is designed. The relationship between average number of iterations, interference degree, convergence time and particle swarms number, channels are simulated and analyzed. Experimental results show that the channel allocation method of ultraviolet light network in this paper has the advantages of fast convergence speed and small degree of conflict. Meanwhile, it can ensure the quickness and accuracy of the channel allocation in wireless ultraviolet network.