The utility model discloses a road construction pitch heating subtracting carbon device, including the inside pitch heating that be double -deck cavity jar, the outer cavity body of pitch heating jar communicates in heating boiler, is equipped with inside in the pitch heating jar inner layer cavity body for the heat exchanger of cavity structure, and heat exchanger's both ends are equipped with air inlet and gas outlet respectively, heating boiler upper end is equipped with exhaust outlet, and exhaust outlet has the filter through waste gas pipe connection, and the filter passes through the pipe to be connected with heat exchanger's air inlet, and heat exchanger's gas outlet is connected with first air pump, and the one end of first air pump is connected with the carbon trapper, once filter the back through adding the leading -in filter of thermogenetic waste gas, and gaseous the entering is heated the pitch of the interior heat exchanger of jar in to the heating pipe and is preheated, and the waste gas behind the rethread carbon trapper secondary treatment passes through the pipe atmospheric dilution, this device equipment is simple, and the energy consumption is low, and waste gas is used for preheating and keeping warm of pitch through the screw -tupe heat exchanger, can make pitch be heated more evenly, delay the ageing of asphalt.