The invention provides a loss-balancing three-way catalytic converter. The loss-balancing three-way catalytic converter comprises a semi-closed round-box-shaped catalyst box, and a catalyst supporting frame is installed in the semi-closed round-box-shaped catalyst box. A shaft hole is formed in the axis of the catalyst box. The loss-balancing three-way catalytic converter further comprises a cylindrical airflow pipe formed by combing an air inlet pipe and an air outlet pipe which are parallel, one end of the airflow pipe is covered with a round end plate, and the end plate is provided with an air inlet hole and an air outlet hole in the areas of the ends of the air inlet pipe and the air outlet pipe; an inserting shaft extending along the axis of the airflow pipe and matched with the shaft hole is fixed to the end plate; after the inserting shaft is inserted into the shaft hole, the airflow pipe is embedded in the catalyst box, and the end plate of the airflow pipe is attached to the end surface of the catalyst supporting frame; and the air inlet pipe is connected with an engine exhausting pipeline, and the air outlet pipe is connected with an exhausting tail pipe. By means of the loss-balancing three-way catalytic converter, all the parts of the catalyst supporting frame can be fully used, so that balanced loss of all the parts is achieved, and the service life of the loss-balancing three-way catalytic converter is prolonged.