A new method of marine multivariate and multi-domain integrated target identification is proposed by focusing on the current practical problems including the incomplete identification system, the lack of underwater identification means and the difficulty of collecting marine target identification information. With this method, a multi-domain networked and collaborative target identification system is constructed based on air, sea surface, land, submarine and other multi-levels nodes; the interconnection and intercommunication of identification information from platforms in various domains is realized through the existing data communication links, submarine acoustic data communication links and other data communication links with identification functions; and the multivariate identification for multi-domain targets is realized through innovate designs including the construction of multi-domain identification system based on sea, land, air and submarine, the multi-domain dynamic networking based on sea buoys, the multiple attribute identification based on multi-sources information and the underwater target identification based on multi-domain networking, etc. The method aims to promote the identification system to develop in all domains, and to provide technical support for target identification to achieve “the all-domain coverage for sea, land, air, space, submarine and shore”, which has good values in military, economic and social domains.