Abstract: Vehicle-mounted drafting equipment needs to meet the requirements of heavy-duty cross-country travelling and compact structure. The working platform is subjected to complex forces and needs to be high-strength and lightweight, while the installation and use of the drafting module affects its structural rigidity, so the structural optimisation design of the working platform is the key to the research and development of the vehicle-mounted drafting equipment. According to the load characteristics and constraints of the working platform to establish a physical model, its static analysis, topology optimisation, and optimization results of the model reconstruction and static analysis. The results show that: through optimisation, under the premise of ensuring structural safety, the working platform reduces weight by 20% to achieve lightweight design, which provides a theoretical basis for the design and improvement of vehicle-mounted working platform.