Theoretical and simulation studies were performed on the link error performance of UAV aerial optical orthogonal frequency division multiplexing communication model. Considering the influence on the communication system of atmospheric turbulence model obeying lognormal distribution and directional error model following Rayleigh distribution, Gaussian-Hermitian integral method was used to calculate the closed expression of link error rate of communication system at the same time. Based on this, the relationship between the beam divergence angle, the symbol rate, the number of subcarriers, the size of the receiving aperture and the system error rate was analyzed with simulations. The results show that under weak turbulence conditions, the transmitter laser has a beam emission angle which can optimize the link error performance, the relationship between the number of subcarriers and the bit error rate was greatly affected by the transmitted optical power, and the aperture size of receiving end of the communication should not be increased.