The invention discloses a low-energy-consumption sapphire crystal growth furnace. The low-energy-consumption sapphire crystal growth furnace comprises a furnace body, a crucible, a heating system, a cooler, a heat exchanger and a controller, wherein the heating system is used for heating the inner part of the furnace body; the cooler is used for cooling circulating water; the heat exchanger is provided with a circulating water flow channel and a protection gas flow channel capable of carrying out heat exchange. The sapphire crystal growth furnace provided by the invention is a low-energy-consumption crystal growth furnace which is relatively environment-friendly and the heating system in the crystal growth furnace can be flexibly adjusted; a heating element in the crucible does not need to be completely covered; crystal growth temperature needed by the crucible can be guaranteed to reach through continuous movement of the heating element; the crystal growth furnace provided by the invention is further provided with the heat exchanger; the heat exchanger is used for carrying out heat exchange between protection gas and the cooled circulating water; heat of the cooled circulating water is used for heating the protection gas filled into the furnace body and the protection gas with certain temperature enters the furnace body, so that the heat insulation effect in the furnace can be improved, and reutilization of the heat of the cooled circulating water of the crucible is realized.