Furnace slag waste heat recovery system

The utility model discloses a furnace slag waste heat recovery system which comprises a steam heat exchange system and a multistage heat energy storage system which are used for the staged recovery of high temperature mixture gases produced during the furnace slag processing course, wherein the steam heat exchange system is connected between a furnace slag processing system and the heat energy storage system and comprises a steam heat exchange device which has more than two stages, and the multistage heat energy storage system comprises a heat storage device which has more than two stages and is used for storing recovered heat energy in different stages according to different temperatures. The furnace slag heat recovery system overcomes the defects that heat energy recovered through traditional furnace slag waste heat recovery and storage method has low quality, small value in use and low recovery rate.