The present invention provides a bean roasting device, comprising: a drum unit comprising a base, a drum pivotally provided in the base and having a receiving space, and a rotation device provided on one side of the base and configured to drive the drum into rotation relative to the base; a heat lamp unit comprising a positioning seat connected to the base, one or a plurality of heat lamp tubes connected at one end to the positioning seat and extending into the receiving space, and one or a plurality of air inlet ducts each provided around a said heat lamp tube and configured to guide air into the receiving space of the drum; and an air supply/venting unit provided on one side of the base, the air supply/venting unit comprising an air guiding portion in communication with the receiving space of the drum and an air blower/air extractor provided on one side of the air guiding portion and configured to provide a positive pressure/negative pressure to the receiving space of the drum through the air guiding portion.