Identity authentication method and system based on big data security

The invention provides an identity authentication method and system based on big data security, and relates to the technical field of big data, and the method comprises the steps: carrying out the target recognition through image collection equipment, and obtaining an image collection set with a time identifier; performing feature recognition on the distance calibration points in the set to generate distance constraint parameters; gait feature extraction is carried out on the image acquisition set, a gait distance constraint key frame is generated according to the distance constraint parameter, and then a gait feature extraction result is obtained; performing user authentication through an extraction result; reading position information of electronic communication equipment of a first user, and sending a verification key; judging whether the electronic communication equipment is connected with the authentication equipment or not, and when the electronic communication equipment is connected with the authentica