The invention discloses an apparatus and a technology for producing the low-iron tin dioxide. The apparatus comprises a reaction furnace, a small-rigidity cooling device, a large-rigidity cooling device, an induced draft fan, an air pipe pressure device and an exhaust fan which are sequentially communicated, and the air pipe pressure device is further connected with an air compressor; the reactionfurnace, the small-rigidity cooling device and the large-rigidity cooling device are all communicated with a cooling water pump and a water return tank, and the cooling water pump is communicated with the water return tank through a cooling water tank; the apparatus further comprises a high-position tin melting pot, an electrode bar graphite head, a servo positioning system, a direct-current discharge device, a PLC system and a video system, the high-position tin melting pot is heated through electromagnetism, and a tin outlet valve is further arranged between the high-position tin melting pot and the reaction furnace; and the direct-current discharge device is electrically connected with the electrode bar graphite head. The electrode bar can be well controlled to move up and down and left and right, the dangerous operation that high-temperature tin liquid in the tin melting furnace is manually beaten into an electrode gun through a ladle is avoided, the labor intensity is reduced, and the labor efficiency is improved.