Timber lounge bridges in China represent significant historical and cultural heritage, yet they are increasingly threatened by frequent fire incidents. Existing studies often lack targeted investigation into timber lounge bridges and fail to develop risk indicators based on their unique structural features, material composition, and conservation contexts. As a result, current assessment frameworks struggle to reflect the specific vulnerabilities of this heritage type. This study takes seven nationally protected timber lounge bridges in Taishun County, Zhejiang Province as case studies and conducts systematic field investigations. A fire risk identification system was developed based on the IPCC risk assessment framework, comprising four dimensions: sensitivity of disaster-pregnant environment, vulnerability of disaster-bearing body, hazard of disaster-inducing factor, and adaptability of fire management. The fuzzy set theory was used to quantitatively define the indicators, enabling the transformation of qualitative field observations into comparable risk data. The results reveal differences in fire risk levels among individual bridges and identify key risk factors prevalent at the regional level. This framework provides foundational data support and methodological basis for fire risk assessment of timber lounge bridges and similar timber cultural heritage structures.