As the problem of the complex optical communication environment and the boundedness of the traditional optical antenna, an optical zoom antenna is designed for mobile visible light communication.The thickness of the antenna is reduced by using right-angle reflecting prism folding the space optical path. The surface type of each lens in the antenna is spherical, which can save the system cost. The simulation results indicate that the zoom ratio of the system is 2.5; the field of view (FOV) can change between 16° and 42°; the system gain is 16.2; the system size is 18 mm×6 mm. The image quality of the system is well and the relative illumination is high, basically satisfying the communication application. At last, an indoor visible light communication system model is set up in a room with a size of 5 m×5 m×3 m, and the comparation of the detection results between the zoom antenna and the fixed-focus antenna in different situations is analyzed. The simulation results indicate that the optical zoom antenna can satisfy the requirement of large field of view and high gain, improve the system stability, mobility and environmental suitability, and be suitable for visible light communication.