A bean roaster device comprises a cylinder unit, a heat lamp unit and an exhaust unit. The cylinder unit comprises a base, a roller installed in the interior of the base and having a space, and a rotating means installed in one side of the base. The heat lamp unit comprises a positioning base connected to the base, one or a plurality of heating tube connected to the positioning base and inserted into the corresponding space, and a wind pipe installed on the outside of the heating tube to guide the air into the space of the roller. The exhaust unit comprises an air guide portion connected to the space of the roller, and a blower installed in one side of the air guide portion so as to provide a negative pressure to the space through the air guide portion.
