The invention discloses an intranet security access method and system based on cloud computing and a mobile public platform. The intranet security access method provided by the invention comprises thesteps of inputting an initial fingerprint and identifying a fingerprint, wherein the step of inputting the initial fingerprint comprises the process of transmitting the input initial fingerprint to aterminal server, and converting the input initial fingerprint into fingerprint information and uploading the fingerprint information to a fingerprint library of a cloud by the terminal server; and the step of identifying the fingerprint comprises the process of inputting the fingerprint of a login person, accessing the fingerprint information from the fingerprint library, comparing the collectedfingerprint with the docked fingerprint information, and entering an intranet after the comparison is successful. According to the intranet security access method and system based on the cloud computing and the mobile public platform provided by the invention, a dedicated encryption card capable of accessing a company intranet security platform is configured, a mobile working terminal can access acompany intranet securely and reliably and a mobile phone terminal in support of externally connected fingerprint collector is provided, so the security of an intranet and internet data interaction interface is completed.