The invention relates to a boiler waste gas waste heat cyclic utilization system. The boiler waste gas waste heat cyclic utilization system comprises a smoke connector, a waste gas treatment device, a heat energy converter and a gas outlet, wherein the smoke connector is arranged on a boiler exhaust port; the smoke connector communicates with the waste gas treatment device; the waste gas treatment device communicates with the heat energy converter; the heat energy converter then communicates with the gas outlet; the heat energy converter comprises a converter shell and a heat exchange pipe; the heat exchange pipe is arranged in the converter shell; the heat exchange pipe is provided with water inlet pipes and a water outlet pipe; the water inlet pipes are arranged close to the gas outlet; the water outlet pipe is arranged close to the waste gas treatment device; the number of the water inlet pipes is three, and the number of the water outlet pipe is one; the water inlet pipes communicate with the water outlet pipe; the water inlet pipes and the water outlet pipe are separately provided with a valve; and the water inlet pipes and the water outlet pipe are V-shaped. According to the boiler waste gas waste heat cyclic utilization system, the shape of the heat exchange pipe is designed according to continuous consumption of waste gas heat, so that waste gas waste heat is fully cyclically utilized.