Provided is a high-temperature phase-change energy storage device used for a greenhouse. The device comprises an internal circulating heat exchanger providing heat supply for a greenhouse, a regulating system, and a non-pressure integrated structure device used for energy storage. The internal circulating heat exchanger is provided with a water inlet and a water outlet of load circulating water. The housing of the non-pressure integrated structure device is provided with a thermal insulation layer. A plurality of groups of energy storage units are arranged in the non-pressure integrated structure device used for energy storage, and ventilating ducts are reserved. A phase-change material is packaged in the energy storage unit, and electrical heating components are arranged in the energy storage unit. The electrical heating components are resistance bars or resistance wires. The internal circulating heat exchanger is communicated with the ventilating ducts in the non-pressure integratedstructure device used for energy storage by an airflow pipe. The airflow pipe is internally provided with a group of circulating fans used to realize heat storage and release of the phase-change material in the energy storage unit device. The group of circulating fans at least include a fan arranged in front of an inlet of the non-pressure integrated structure device used for energy storage, and afan arranged on the rear of the non-pressure integrated structure device used for energy storage.