The invention relates to a smokeless barbecue oven; a burner is arranged at the upper part of the barbecue oven; a flue gas catalyzing medium layer is adhered to the surface of the burner; a barbequebase plate and a barbeque grill are placed at the lower part of the barbeque oven, thus avoiding the defect that exceeded oily substances fall or splash onto the burner to produce oil smoke during barbecue; a burning inner cavity which is provided with a flue is arranged at the upper part of the barbecue oven; flue gas catalyzing media is adhered to the flue; when in use, the burner automaticallyexhausts combustion tail gases from the flue, takes in air from an air inlet and imbibes the flue gases which are produced by the barbecue section at the lower part to the top; the flue gases producedduring barbecue are imbibed into the flue and are rapidly decomposed at high temperature; and the flue gas catalyzing media adhering to the burner and the flue can decompose the flue gases imbibed. Owing to novel conception, skillful design, simple structure and convenient carrying and transportation, the smokeless barbecue oven has good application effect that the barbecued food is sanitary andhas no peculiar smell, prevents the environment from being polluted by barbecuing food and completely realizes the smokeless phenomenon of the barbecue.