An electrochromic display device comprises: a first electrode substrate; a second electrode substrate; an electrochromic fluid distributed between the first and the second electrode substrate; and a dividing wall located between the first and the second electrode substrate, contacting the first and the second electrode substrate, respectively, and used for isolating the electrochromic fluid into various pixel areas. The electrochromic display device has no interference occurred between adjacent pixel areas. A method for producing such an electrochromic display device is further disclosed.