The invention discloses a high-temperature waste hot gas reusing device of a cord austenite furnace, the lower end part of a tank body is provided with a flume inlet cavity, the upper end part is provided with a flume discharging cavity and the middle is provided with a heat exchange water cavity; a water inlet pipe, a water discharging pipe and a steam discharging pipe are arranged on the heat exchange water cavity and a vertical smoke tube is arranged passing through the heat exchange water cavity ; the upper and the lower end of the smoke tube are respectively communicated with the flume discharging cavity and the flume inlet cavity which is communicated with the smoke discharging mouth of the cord austenite furnace, the flume discharging cavity is communicated with a chimney, the water inlet pipe and the water discharging pipe of the heat exchange water cavity are respectively communicated with both ends of the heating tube in a plating bath body, the plating solution of which is heated circularly. The device has the advantages of reasonable design, high residual heat utilization rate of a high temperature furnace, energy saving, environment pollution reduction and good socialand economical benefits.