Polycrystalline silicon ingot casting furnace

The utility model discloses a polycrystalline silicon ingot casting furnace. The polycrystalline silicon ingot casting furnace comprises a furnace body, a cooling water sandwich, a cooling water inlet and a cooling water outlet, wherein the cooling water sandwich passes through the bottom of the furnace body, and the cooling water inlet and the cooling water outlet are respectively communicated with the cooling water sandwich; three-way valves which are used for importing or exporting cooling water are respectively arranged at the cooling water inlet and the cooling water outlet and can be connected with the outside atmosphere, and draining valves which are opened from the outside are arranged at the bottom of the furnace body and are communicated with the cooling water sandwich. According to the polycrystalline silicon ingot casting furnace disclosed by the utility model, when silicon liquid of a crucible leaks, the cooling water in the sandwich of the furnace body can be evacuated promptly, so as to avoid the danger of explosion occurring after silicon liquid leakage.