The utility model discloses a waste heat utilizing and circulation use device for extruder cooling water, and the device comprises a screw cylinder pond (2), a heat exchanger (4), a domestic water pond (5) and water pumps (701, 702). The extruder cooling water with high temperature is used to heat domestic water with normal temperature, and the extruder cooling water which is cooled can be circularly used, so the waste of heat energy is avoided. Simultaneously, normal temperature soft water which can be circular is provided for the cooling of an extruder screw cylinder for reducing the waste of energy and water resources, reducing pollution, and lowering cost.