The invention relates to the technical field of the network security, and specifically relates to a network security protection system about big data. The system comprises a data saving module, a data access module and a data acquisition module; the data saving module comprises a data center and a backup module; the data access module comprises an extranet, a priority evaluation module, a data request module, a first behavior recording module and a firewall; the data acquisition module comprises a control host, a second behavior recording module and a data request point; and two ends of the data center are respectively connected with the priority evaluation module and the backup module. Two ends of the data center are connected with the priority evaluation module and the backup module; a TPM security chip is arranged in the control host, and the TPM security chip has the function of producing an encryption key/a decryption key so as to perform the encryption in an extensive range; and a request command for requesting the related data information by a user can be well protected in the transmission process.