The invention discloses an aluminum industry solid waste recovery/petroleum coke high-temperature desulphurization device and a using method thereof, and belongs to the technical field of metallurgy environmental protection. The device comprises a furnace body, a low-melting-point matter crystallizer at the rear end of the furnace body, and a liquid low-melting-point matter collector below the low-melting-point matter crystallizer. A main material chamber in the furnace body is used for containing aluminum electrolysis cell waste cathode carbon broken blocks or petroleum coke used as a resistance heating body. A sleeve is arranged at the rear end of the furnace body to be communicated with the low-melting-point matter crystallizer. The bottom of the low-melting-point matter crystallizer is communicated with a liquid collector through a valve. The using method mainly comprises the steps that the resistance heating body is placed into the main material chamber, vacuumizing is carried out, cooling water is introduced, the resistance heating body is powered on and heated, vacuumizing and heating are stopped after vacuum high-temperature separation, argon is introduced, and materials coagulated by the low-melting-point matter crystallizer are heated to be molten to enter the liquid low-melting-point matter collector. According to the device and the method, operation is easy, energy is saved, and pollution is reduced.