The cross-border tourism cooperation in Northeast Asia is well-grounded. In recent years，cross-border tourism in Northeast Asia has become increasingly vital，and its huge market cannot be ignored. With the continuous deepening of economic and trade cooperation among countries in the region，bilateral and multilateral cross-border tourism has also made substantial progress. China and Russia，China and Japan，China and South Korea，China and North Korea，and China and Mongolia have achieved remarkable results in their bilateral tourism cooperation. China，Japan and South Korea，China，Russia and Mongolia，China，Russia and South Korea，and China，Russia and North Korea have also made initial progress in trilateral cooperation. However，the cross-border tourism in Northeast Asia also faces many problems，such as incomplete cooperation mechanisms，incomplete infrastructure，and lack of tourism talents that affect the further development of the tourism industry. This article analyzes the current situation，characteristics，and problems of multilateral cross-border tourism in Northeast Asia and proposes countermeasures and suggestions.