The utility model relates to an exhaust heat sink, its characterized in that: convergent formula exhaust gas inlet, flaring formula cooling air entry, the gas mixing passageway, coaxial the arranging of flaring formula gas outlet, convergent formula exhaust gas inlet's entry and engine exhaust discharge the pipeline and link to each other, convergent formula exhaust gas inlet's the export and the entrance of gas mixing passageway are in the coplanar, the export of flaring formula cooling air entry links to each other with the entry of gas mixing passageway, the export of gas mixing passageway links to each other with the entry of flaring formula gas outlet, the entry of flaring formula gas outlet links to each other with external atmosphere. The device only needs install it in the former tub position of discharging fume under the prerequisite that does not exert an influence to former military vehicle overall arrangement and structure size, can realize utilizing the tail gas energy to draw from external environment and penetrate the air, realize high temperature tail gas and ambient air's better mixture and reduce tank exhaust gas temperature and infrared intensity, has improved the stealth ability of vehicle.