Horizontal-type heating furnace

The utility model belongs to heating equipment special for an oil and gas field and particularly discloses a horizontal-type heating furnace. The horizontal-type heating furnace comprises a furnace body, wherein a heat transfer device and a combustion device are arranged in the furnace body. The heat transfer device is formed by a heating coil. Two ends of the heating coil extend outside the furnace body. The combustion device is formed by a combustion chamber, a smoke tube and a smoke box. The combustion chamber, the smoke tube and the smoke box are connected end to end. The end of the combustion chamber and the end of the smoke box extend outside the furnace body. A fire hole is formed in the end. An explosion-proof device is arranged on the smoke box. A detection opening is formed in the furnace body. A liquid level display opening is formed in the furnace body. A connecting hole and a lifting lug are arranged on the furnace body. Supporting devices are arranged at the bottom of the furnace body. The horiz