The utility model discloses a liquefied natural gas (LNG) storage tank provided with a support pillar. The LNG storage tank comprises an LNG storage tank body; the LNG storage tank body comprises an outer tank and an inner tank arranged in the outer tank; the support pillar is arranged in the LNG storage tank, and the support pillar is connected with the dome of the outer tank; cold insulation materials are arranged between the support pillar and the wall of the inner tank in a filling manner; and the support pillar is arranged in the center of the LNG storage tank. By arranging the cold insulation materials between the support pillar and the inner tank and arranging the heating device in the support pillar, the support pillar encapsulated by low-temperature liquid for a long time can keep the normal operation state.