The invention discloses a device used for noodle preparation and fixed-length cutting. The device comprises a bar-shaped support plate, one end of the upper surface of the bar-shaped support plate is fixedly connected with a bar-shaped hollow box; the bar-shaped hollow box is internally equipped with an extruding-flaking mechanism; the inner side of the bar-shaped hollow box is equipped with a noodle molding mechanism, which is also located at the right side of the extruding-flaking mechanism; the lower surface of the bar-shaped hollow box is equipped with a supporting-transferring mechanism; the upper surface of the bar-shaped support plate is equipped with a swinging fixed-length-cutting mechanism, which is also located at the right side of the bar-shaped hollow box; the lower surface of the bar-shaped support plate is equipped with a mobile mechanism; and the lateral surface of the bar-shaped hollow box is equipped with a controller. The device has beneficial effects of simple structure and high practicability.