Radiation heating main machine and radiation heating system

Relates to the heat supply technology and discloses a radiation heating main machine and a radiation heating system. The main machine comprises a combustion engine, a working cavity, a first connector, a radiant tube and a second connector, the radiant tube comprises an air inlet end and an air return end, and the air inlet end is connected to the working cavity through the first connector. The utility model provides a radiation heating main machine and a radiation heating system which are simple in structure and more convenient to install. According to the embodiment, two volute-shaped air cavities, a negative pressure air return cavity and an air supply combustion cavity are formed in the working cavity, a Y-shaped air separation plate is arranged between the two cavities, and a flow guide plate is arranged in the direction facing the airflow direction of the combustion cavity, so that a rotating airflow is formed in the combustion cavity, and the airflow of the air return cavity is guided to the combustion