The invention provides a circulating heat exchange device and method for improving heat exchange efficiency, and relates to the field of hot air equipment. The circulating heat exchange device comprises a stove body, a heat conduction pipe and a circulating pipe; the heat conduction pipe and the circulating pipe are arranged in a furnace of the stove body, the circulating pipe comprises a venturipipe and a return pipe arranged outside the venturi pipe in a sleeving mode, and one end of the return pipe is connected with the stove body to form an air outlet; the other end of the return pipe isconnected with the heat conduction pipe, a circulation channel is formed between the outer wall of the venturi pipe and the interior of the return pipe, one end of the circulation channel and one endof the heat conduction pipe jointly communicate with an inlet of the venturi pipe, and the air outlet and the other end of the circulation channel jointly communicate with an outlet of the venturi pipe, the furnace communicating with the outside is arranged to heat the heat conduction pipe and the circulating pipe together, indoor oxygen is not consumed while hot air is output, heat exchange is conducted without air exchange, a circulation heating channel is formed inside the circulating pipe, airflow output by the backflow part is subjected to secondary heating, sufficient mixing is conductedin cooperation with the venturi pipe structure, the heat exchange efficiency is improved, and the requirement for rapid starting is met.