The environment in which overhead transmission lines are situated is complex. During maintenance operations, manual climbing of towers with maintenance tools is required for high-altitude work, posing significant risks and resulting in low efficiency. Although existing transmission line inspection robots have reduced the need for manual labor to some extent, they are unable to carry large equipment and workers for both ascending and descending, making the issue of handling large loads a crucial bottleneck in the practical application of robots. In response to this challenge, an intelligent transport platform for large loads in complex power transmission scenarios was developed. The platform underwent mechanical system design, electrical system selection, and control system integration. Ultimately, a physical prototype of the intelligent transport platform for large loads in complex power transmission scenarios was developed, and experiments were conducted on a simulated transmission line setup. The experimental results indicate that the platform is capable of autonomously handling the ascent and descent of a 100kg large load, along with climbing slopes, meeting the operational requirements of the power grid.