The invention discloses a slag flushing water heat recovery device. The slag flushing water heat recovery device comprises a recovery furnace; the top of the recovery furnace communicates with a material charging port for adding high-temperature slag into the recovery furnace and a liquid charging port for adding low-temperature medium mediums; the liquid mediums fed into the recovery furnace fromthe liquid charging port are heated by the high-temperature slag falling from top to bottom in the recovery furnace to form steam; the high-temperature slag is accumulated in the recover furnace after falling from top to bottom; one end of a steam circulating pipe communicates with the upper part of the recovery furnace, and the other end communicates with the bottom of the recovery furnace; thesteam formed by heating the high-temperature slag falling in the recovery furnace from top to bottom is leaded into he bottom in the recovery furnace by the steam circulating pipe, and upwards penetrates through the high-temperature slag accumulated in the recovery furnace for reheating; and the heated steam is discharged from a steam discharge port communicating with the recovery furnace. The slag flushing water heat recovery device is simple in structure, reasonable in design, less in needed equipment and less in occupied space, and exchanges heat in the slag outside through multiple times of temperature rise for utilization of the heat in the high-temperature slag.