To improve the data credibility and readability of the hazard analysis and critical control points (HACCP) national standard for aquatic products in terms of quality traceability, the enhanced HACCP credibility and visualization traceability model (EHCVTM) was proposed by using the example of the pasteurized crabmeat HACCP plan in the national standard. By combining semantic modeling and blockchain technology, the model comprehended the pasteurized crabmeat HACCP plan according to the national standard, a HACCP quality and safety data system (HQSDS) was established for the plan, and the knowledge representation was designed. A reasonable data storage structure and smart contracts for the generated enhanced HACCP plan was further devised, achieving a data classification storage mode of “risky data on-chain, risk-free data autonomous” and “high-risk data directly on-chain, low-risk data encrypted on-chain”. Then different visualization displays were implemented by using a graph database to meet various needs. The application prototype based on EHCVTM for HACCP traceability was tested and proven successfully. The results demonstrated that this model ensured the credibility of risk data in traceability, improved data readability during feedback, strengthened the platform’s warning capability, and enabled internal monitoring for enterprises, externally multi-party supervision, public risk disclosure for quality safety, and precise positioning of safety responsibility. Moreover, the blockchain-based system achieved a throughput of 300 transactions per second, which effectively met the traceability system’s business requirements. The research result can provide a perspective for credible and visual traceability of aquatic products quality and safety risk monitoring based on the HACCP national standard.