A washing device (1) for spray guns (16) and their components (16', 16'') equipped with separate automatic (6) and manual (7) washing zones, comprises a boxed casing (2) suitable for housing in its interior a washing zone (3) and a collection and feeding zone (4). According to the invention, said device is characterized in that the washing zone is subdivided into a first zone (6) for automatic washing, and at least a second zone (7) for manual washing, and in that a swinging separation door (29), hinged on top by hinges (30) to the structure of the boxed casing (2), separates said two washing zones (6, 7) from each other.