The invention discloses an energy-saving device for a dry reforming process, which comprises a housing, an energy storage, a dry reforming reactor and a gas-liquid separator. The energy storage is arranged between the existing dry reforming reactor and the gas-liquid separator; high-temperature gas released by the dry reforming reactor and low-temperature gas which is to react are subjected to heat exchange by a low-temperature gas tube and a high-temperature gas tube which are wound outside the energy storage and phase change paraffin inside the energy storage so as to implement recycling ofheat; the device can effectively utilize heat released by a dry reforming reaction to carry out preheating of reaction gas, and the arranged energy storage can sufficiently store and release heat energy so as to reduce loss of heat energy; according to the invention, by optimization on the device, process flow is reduced, energy consumption is reduced, and production efficiency is improved; and the device can be used for the process of the dry reforming process.