Antenna pattern measurement is an important part of antenna measurement. Addressing the difficulty of outdoor measurement of antenna pattern， this paper presents an outdoor measurement scheme for antenna three-dimensional pattern based on the generative adversarial network. An unmanned aerial vehicle （UAV） is used to collect the antenna pattern data， modify the collected data， and obtain the direct path data when the receiving antennas match with the polarization of the antenna to be measured. Finally， the three-dimensional pattern of the antenna is reconstructed by using the trained generative adversarial network. Simulation results show that the proposed scheme can complete the measurement of antenna three-dimensional pattern efficiently and accurately， showing practical value.