The present invention provides a bean roasting device (100), comprising: a drum unit (10) comprising a base (11), a drum (13) pivotally provided in the base (11) and having a receiving space (12), and a rotation device (14) provided on one side of the base (11) and configured to drive the drum (13) into rotation relative to the base (11); a heat lamp unit (20) comprising a positioning seat (21) connected to the base (11), one or a plurality of heat lamp tubes (22) connected at one end to the positioning seat (21) and extending into the receiving space (12), and one or a plurality of air inlet ducts (23) each provided around a said heat lamp tube (22) and configured to guide air into the receiving space (12) of the drum (13); and an air supply/venting unit (30) provided on one side of the base (11), the air supply/venting unit (30) comprising an air guiding portion (31) in communication with the receiving space (12) of the drum (13) and an air blower/air extractor (32) provided on one side of the air guiding p
