With the continuous expansion of power transmission lines across forest areas, risks of forest fires triggered by equipment aging, cable short-circuits, and other electrical faults have significantly increased. Although technologies such as remote sensing, IoT, and artificial intelligence have been widely adopted for forest fire monitoring, challenges remain in evidence collection, data credibility, and post-incident traceability for liability determination. To address these issues, this paper proposes a blockchain-based electronic evidence management platform tailored for the correlation analysis between electrical equipment failures and forest fires. Centered on distributed ledger technology, cross-chain data sharing, and smart contracts, the platform encrypts and preserves key data—including wildfire monitoring records, equipment operation status, and multimedia evidence—in real time, establishing an end-to-end, tamper-proof evidence chain. By integrating with judicial blockchains and forensic appraisal centers, the system upgrades the legal validity and credibility of electronic evidence, enabling a digital closed loop of evidence generation, preservation, appraisal, and retrieval. The research results comprehensively enhance the management capability of cross-forest power lines, effectively support the investigation and liability determination of forest fire cases, and have good promotion value.