Disaster chains usually consist of multiple disaster elements with mutually induced chain reactions between them. Typhoons may cause rainstorms and flooding secondary disasters in coastal areas, which may cause transmission tower toppling accidents. Therefore, it is necessary to propose a risk assessment method for transmission towers that simultaneously considers typhoons, rainstorms and floods. This paper proposes a risk assessment framework for transmission towers based on analytic hierarchy process that simultaneously considers typhoons, rainstorms and flooding disasters. Firstly, we establish a risk assessment system for transmission towers based on analytic hierarchy process under typhoon-rainstorm-flood disaster chain including potential faults, disaster mitigation capability and climate change. Then the weight of the disaster factors is calculated through the judgment matrix, and the risk assessment method of transmission towers is obtained by combining the expert scoring table. Finally, the method's feasibility is verified by the case of a tower toppling accident caused by Typhoon Talim (2023) in Guangdong Province in China.