Sea Shepherd is a non-governmental organization whose mission is to end the destruction of habitat and the slaughter of animals in the ocean to protect and preserve the oceanic ecosystems along with the species in it. One of the cases Sea Shepherd struggles is to end the whale hunting practiced by Japanese fishermen since centuries ago. Now, Japan Government uses scientific research to justify their actions for whaling. However, this activity still considered as the action that could bring whale to extinction. This research explains how the NGO Sea Shepherd attempts on suppressing whale hunting in Japan. The author uses two theories, and those are Transnational Advocacy Network (TAN) and Non-Governmental Organization by analyzing the strategy of information politics and symbolic politics in TAN and the advocacy function through the campaign from the concept of NGO.