Abstract: The large log-periodic antenna has large overall size, high erection height, strict weight requirements and strict cost control. These requirements bring great challenges to the structure design of large log-periodic antenna. Starting from the structure design requirements of large log-periodic antenna, according to its structure design characteristics, combined with the requirements of production, on-site erection and cost control, this paper designs a lightweight antenna structure with low wind resistance, low cost and high performance, and carries out the three-dimensional wiring design and on-site erection planning. In addition, the rationality of the structure design of the antenna is verified by the finite element mechanical simulation and analysis. The structure is simple, easy for mass production and its cost is also low. It can provide some reference for the structure design of other large antennas.