The invention discloses a multi-trust-domain trusted video sharing method and system, achieving the video domain gateway based on a block chain, and achieving the trusted management of video equipmentin a domain through the setting of video domain gateways in different trust domains. Meanwhile, inter-domain trust is established through the video domain gateway, aimed at cross-domain video sharingand collaborative analysis requests, video sharing and video collaborative analysis among multiple trust domains are achieved based on trusted authorization verification, then trusted video sharing and collaborative analysis are achieved. The problem that video sharing and collaborative analysis are difficult to achieve due to mutual untrust is solved, and larger-range and higher-efficiency videosharing and higher-value target analysis are achieved.