1. A liquid immersion tank comprising:a first tank configured to store coolant to cool an electronic device provided in the first tank;
a first plate horizontally disposed below the electronic device and configured to include a plurality of straightening holes that penetrate through the first plate in a vertical direction; and
a second plate disposed below the first plate and configured to be movable from an overlap position overlapped by the first plate to a spaced position where the second plate is disposed below the first plate and spaced from the first plate, the second plate including a plurality of flow adjusting holes that are formed at positions respectively aligned with the plurality of straightening holes and that penetrate through the second plate in the vertical direction,
wherein, in a region where the first plate overlaps the second plate, a total opening area of the plurality of flow adjusting holes is smaller than a total opening area of the plurality of straightening holes.