The invention discloses a device and method for breeding arma chinensis fallou by transforming and utilizing a baking room during idle time. The device comprises a tobacco loading chamber, a stand column and a feeding device; the feeding device comprises a reciprocating lifting mechanism, feeding cages arranged on the reciprocating lifting mechanism at intervals, lighting lamps arranged in the tobacco loading chamber, a temperature control device and a humidity control device; the temperature control device comprises a temperature sensor, a temperature controller and an air refrigerating and heating device; the humidity control device comprises a humidity sensor, a humidity controller, a humidifier and a dehumidifier; the feeding cages are used for providing the space needed by feeding thearma chinensis fallou; the lighting lamps, the temperature control device and the humidity control device are used for providing illumination, temperature and humidity conditions needed by normal growth of the arma chinensis fallou respectively; the baking room is creatively transformed to be the breeding place of the arma chinensis fallou, not only is the breeding space needed by growth and development of the arma chinensis fallou provided, but also the economic value of use of the baking room is improved.