Galvanized spiral duct

The utility model discloses a galvanized spiral duct which structurally comprises a duct body and a duct connector, a port of the duct body is jointed through the duct connector, the duct connector comprises a locking ring, a movable groove, limiting blocks, a hoop groove and an outer protective ring, more than two limiting blocks are arranged in the outer protective ring and are arranged in an annular array, and the limiting blocks are arranged in the hoop groove. A movable groove is formed between the limiting blocks, the hoop groove is formed in the connecting position of the limiting blocks and the outer protection ring, and the locking ring is arranged in the movable groove and movably connected with the movable groove. The device has the beneficial effects that the air pipe body nested in the outer protective ring is fixed through the locking ring, the air pipe body is attached to the interior of the outer protective ring in a nesting and back clamping plate reverse clamping mode, compared with an exist