The utility model discloses an adjustable burner bracket device and a horizontal converter in order to solve the problems of low smelting quality and low working efficiency due to incapability of accurately making flame sprayed out by a burner reach the required position and direction in the case of non-adjustable burner bracket of the conventional horizontal converter. The adjustable burner bracket device comprises an outer support which is arranged on the end part of the body of the converter, wherein a sliding seat frame is movably connected to the outer support and is provided with a sliding seat for mounting the burner; the sliding seat is connected with a pushing screw on the sliding seat frame; and a telescopic rod for adjusting inclination angle of the sliding seat frame is also arranged between the outer support and the sliding seat frame. The horizontal converter comprises the adjustable burner bracket device. According to the adjustable burner bracket device and the horizontal converter provided by the utility model, the burner is extremely convenient to adjust and maintain, the phenomena of slow and non-uniform temperature rise in the converter and burning loss of a converter shell burner hole are solved, the smelting quality and the combustion heat efficiency of the converter are improved, and the energy consumption is low.