The invention discloses a method and a system for waste gas waste heat recovery and pollutant comprehensive treatment. The system mainly comprises a waste heat recovery device, a volatile organic chemicals (VOCs) gas resource recovery and treatment device and a particulate pollutant removing device. The waste heat recovery device comprises a feeding hole, a gas buffer tank, an induced draft fan, a waste gas cooler, a water-feeding pump, a flash evaporator and a power device. The VOCs gas resource recovery and treatment device comprises an absorption device, a feed pipe, a heat exchanger, a delivery pump, a desorption device, a condenser and an organic solvent storage tank. The particulate pollutant removing device comprises a desulfurization tower, a gravity settling chamber, high performance wet type electro-filtration equipment, a chimney and an induced draft fan. The method and the system not only can be used for recycling the waste heat in waste gas, but also can be used for carrying out comprehensive treatment on poisonous and harmful gases and fine particulate pollutants in the waste gas.