The invention discloses an open width inspection device. The open width inspection device comprises cloth inlet double rolls, a main rack, a winding frame and a main motor, wherein a bottom illuminating structure, an inspection main roll, an inspection secondary roll and an inspection main flat plate are arranged on the main rack; the cloth inlet double rolls comprise two cloth inlet rolls of which the axes are horizontal and the rotating directions are opposite; the inspection main roll and the winding frame are respectively positioned on two opposite sides of the inspection secondary roll; the axis of the inspection main roll and the axis of the inspection secondary roll are horizontal and are positioned at the same height; an inspection hole is formed in the inspection main flat plate; the bottom illuminating structure is positioned just below the inspection hole and comprises a bottom illuminating rack and a plurality of LED lamp tubes arranged on the bottom illuminating rack; and the winding frame is provided with a cloth winding motor and a cloth winding roll driven by the cloth winding motor. The open width inspection device has the beneficial effects that the structure is reasonable, functions of feeding, conveying in a guided manner and the like can be fulfilled, uniformity of illumination of an inspected part is high in an inspection process, observation is facilitated, continuity of the inspection process is good, and coiling can be realized automatically after inspection.