Method for storing cold energy of liquefied natural gas, ice making method and ice making device

The invention discloses a method for storing cold energy of liquefied natural gas. The method comprises the steps that first-stage heat exchange heating is conducted on the liquefied natural gas through a first refrigerant; secondary heat exchange heating is conducted on the low-temperature liquefied gas through a second refrigerant; heat exchange heating is conducted on the cooled first refrigerant and the cooled second refrigerant through an ethylene glycol solution; primary heat exchange heating and secondary heat exchange heating are conducted on the liquefied natural gas; and the cooled ethylene glycol solution is conveyed to a cold liquid carrying pool for storage. Compared with the prior art, the method has the advantage that the problem that the liquefied natural gas vaporization cold energy utilization rate is low is solved through multi-stage heat exchange between cold carrying media. According to the method, two intermediate media are adopted on the basis of a common liquefied natural gas cold ener