The utility model discloses a lithium chloride dehumidification device, which is used for the ambient temperature and humidity control in a ventilation system in an electronic copper foil manufacturing process. The lithium chloride dehumidification device comprises a filter, a lithium chloride spraying dehumidifier, a spraying pump, a plate-type cooler, a fan, an air conditioning unit, a proportional adjustment valve, a regenerative pump, a lithium chloride regenerator and a plate-type heat exchanger, wherein the lithium chloride spraying dehumidifier, the spraying pump and the plate-type cooler form a lithium chloride dehumidification system; the lithium chloride regenerator, the regenerative pump and the plate-type heat exchanger form a lithium chloride regeneration system; the lithium chloride spraying dehumidifier and the lithium chloride regenerator form a lithium chloride circulating system through the spraying pump, the proportional adjustment valve and the regenerative pump. According to the lithium chloride dehumidification device, the aim of reducing air humidity is realized by directly absorbing moisture in air through adopting the characteristic that the lithium chloride has high moisture absorption in a dehumidification process; the dehumidification efficiency is high; meanwhile, the air is not required to be heated after being frozen and dehumidified, so that energy consumption can be prevented, and the electrical energy and the steam consumption are greatly saved.