The invention discloses a circulation steam denim spraying dyeing device, which belongs to the textile field, and comprises a dyeing device main body (1), a dosing port (2-1,2-2), a dye box (3-1,3-2), a plasma generator (5-1,5-2), a moving shaft wheel (6-1,6-2), a rotating driver (7), a support rod (8), a bearing seat (9), a steam guide pipe (10), a steam machine (11) and a denim (12). The circulation steam denim spraying dyeing device solves the problems that denims are close and thick in texture, is easy to have uneven dyeing, has poor wet rubbing fastness translucency and hard fabric feel, achieves the advantages of low energy consumption, no pollution, high performance and full automation and the like, can effectively improve dyeing efficiency and dyeing degree, and prevents color of denims from fading and losing.