The invention discloses a security network high-definition camera. The security network high-definition camera comprises a processor, a cryptographic chip and a COMS (Complementary Metal Oxide Semiconductor) sensing module, wherein the processor is used for performing image signal processing, image compression and decoding, and controlling image input and output; the COMS sensing module is used for acquiring images; and the cryptographic chip is used for encrypting video data. The security network high-definition camera disclosed by the invention carries a data encryption module designed on the basis of a homemade cryptographic chip, and a video data encryption process of the camera is performed through a key management center (KMC) by means of a hardware encryption function of the module. Through adoption of the security network high-definition camera, the requirements of current high-definition network monitoring can be met; the transmission security of video data in a monitoring system can be ensured; and the secure use requirements of government departments and secret units are met.