The invention discloses a system and a method for utilizing heat energy of pyrolysis products of carbon-containing organic matters. The system comprises a pretreatment device, drying equipment, a heat storage type rotary bed, a first heat exchanger and a second heat exchanger. The drying equipment is connected with the pretreatment device; a feed inlet, a gas and liquid mixture outlet, a pyrolytic carbon outlet, a heat storage type radiant tube preheated air inlet, a heat storage type radiant tube fuel gas inlet and a heat storage type radiant tube flue gas outlet are formed in the heat storage type rotary bed; a pyrolytic carbon inlet, a residual carbon outlet, a circulation nitrogen inlet and a hot nitrogen outlet are formed in the first heat exchanger, the pyrolytic carbon inlet is connected with the pyrolytic carbon outlet, and the hot nitrogen outlet is connected with the drying equipment; a cold nitrogen inlet, a water vapor inlet, a cooling water outlet and a circulation nitrogen outlet are formed in the second heat exchanger, and the cold nitrogen inlet and the water vapor inlet are respectively connected with the drying equipment. The system and the method have the advantages that waste heat of pyrolytic carbon of the carbon-containing organic matters can be utilized by the system in an indirect heat exchange manner, and the system is low in integral running cost.