The invention discloses an encased concrete nodular cast iron pipe manufacturing device and relates to the technical field of nodular cast iron pipe manufacturing equipment. The device comprises a movable trolley and riding wheel sets arranged at the two ends of the trolley and driven by motors, wherein the two ends of a nodular cast iron pipe are erected on the riding wheel sets through a bellmouth rolling ring and a socket rolling ring respectively, a concrete roller shoot mechanism and a scraper sizing structure are arranged above the nodular cast iron pipe, a steel wire gauze feeding mechanism is arranged on one side of the nodular cast iron pipe, and band-shaped steel wire gauze can be wound around the nodular cast iron pipe coated with concrete in a spiral mode by means of the steel wire gauze feeding mechanism along with the rotation of the nodular cast iron pipe and the movement of the trolley; the scraper sizing structure is an arc-shaped plate matched with the outer circle of the nodular cast iron pipe, and a toothed plate and a fine scraping plate are arranged at the two ends of the arc-shaped plate respectively to be used for cutting off redundant concrete and trowelling grooves formed after cutting; in this way, surface roughness is improved, and the labor intensity of workers is relieved. The device is high in mechanization degree and capable of improving working efficiency and product quality.