The invention relates to the field of precious metal smelting equipment, and in particular, relates to the field of recovery of precious metal by using a plasma smelting furnace. A secondary combustion chamber furnace door device of a precious metal recovery plasma furnace comprises a furnace door (1) for covering a furnace port; the furnace door (1) consists of a hollow furnace door (2) and a refractory body (3); the refractory body (3) is arranged on the inner side of the hollow furnace door (2); a cooling water inlet (4) is formed in the lower part of the outer side of the hollow furnace door (2); and a cooling water outlet (5) is formed in the upper part of the outer side of the hollow furnace door (2). The secondary combustion chamber furnace door device of the precious metal recovery plasma furnace further comprises a rotating shaft mechanism (6), a side positioning plate (7), a lower positioning plate (8), a slide system (9) and a fixture (10); and the slide system (9) consists of a rail (11) and a slide wheel (12). The secondary combustion chamber furnace door device of the precious metal recovery plasma furnace can guarantee the plasma smelting furnace to clean a flue in the precious metal smelting process, prevents potential safety hazards, guarantees enough operation space, reduces the labor intensity, guarantees the personal safety, reduces the heat loss, and protects the environment.