The invention relates to a video data sharing system comprising a video acquisition terminal, a video metadata module, a user module, a video sharing module, a video verification module and a user authentication module, wherein the video acquisition terminal is responsible for acquiring video data, coding the acquired video data to obtain the coded video data, generating a hash code according to the coded video data, submitting the hash code to a block chain system to exchange for a video certification code, storing the video certification code into the video data as a video information enhancement frame to make the video data have the anti-tampering capability, and submitting the video metadata to the video metadata module in a timed manner; the video metadata module is used for storing and retrieving the video metadata; the user module is responsible for applying video data and submitting the video data; the video sharing module is responsible for coordinating the video data; and thevideo verification module is used for checking whether the video data submitted by the user is tampered or forged, wherein the user authentication module is responsible for user identity authentication.