The present invention relates to a commodity authenticity identifying method and system based on cloud technology and million-level encrypted two-dimension codes. A cloud technology framework where a cloud computing platform and a cloud computing terminal mutually cooperate is adopted; the cloud computing platform is responsible for encoding, compression, encryption, generation, activation, assignment and management of million-level encrypted two-dimension codes, and provides commodity authenticity identifying services for consumers; and the cloud computing terminal is responsible for giving encrypted two-dimension code identifications to commodities. By using strong computing capabilities and performance of the cloud technology and a convenient automatic centralized management mode, the operating efficiency, reliability, flexibility and robustness of the system are ensured.