The utility model relates to the technical field of seawater desalination, and particularly relates to a low-temperature multi-effect distillation seawater desalination system. The low-temperature multi-effect distillation seawater desalination system comprises a hot compression unit, a shell, an effect condensator, spray devices and heat exchange tube bundles, wherein the shell is in a parallel hexahedron shape; the side part and the top of the shell are respectively provided with sealing doors; the internal part of the shell is partitioned into at least two effect evaporators; all effect evaporators are arranged in parallel; the heat exchange tube bundles are respectively arranged inside the effect evaporators; the spray devices are respectively arranged above condensation tube bundles in all effect evaporators except for the effect condensator which is internally arranged at the tail end; the inner side part of the effect evaporators at the tail end is provided with the effect condensator. According to the low-temperature multi-effect distillation seawater desalination system provided by the utility model, the floor area is reduced, and thus, the construction cost is reduced, and the amount of distilled water and steam can be stably adjusted.