The invention relates to the field of low-temperature cold accumulation technology, in particular to a low-temperature cold accumulation method and a device for chemical production. On the basis of the property that saline solution has a eutectic temperature below zero and the concentration corresponding to the eutectic temperature is unique, and the specific temperature required in the engineering is the same with or similar to the eutectic temperature of a corresponding certain saline solution, i.e., an concentration corresponding to the eutectic temperature of the saline solution can be prepared in the engineering, that is to say, the phase transition at the eutectic temperature can be realized so as to realize the cold accumulation and the cold release at eutectic temperature, whereinthe cold accumulation and the cold release can be separately carried out independently and simultaneously. A condensation and slice ice system is provided with a slice ice machine, the slice ice machine is arranged above an ice accumulating tank, a frozen saltwater circulating system is provided with a spray system, and the spray system is arranged on the slice ice machine. The frozen saltwater uses the saline solution as the secondary refrigerant as well as the ice medium, a frozen saltwater sending system is an independent outer supplying low-temperature saltwater system, and the back waterreturns to the ice accumulating tank or the spray system.