The invention discloses a detection device used for cloth bead sheets. A problem is solved that it is hard for a detection worker to find out an omission position from a large number of bead sheet groups by eyes, thereby causing detection faults and allowing a lot of unqualified clothes to be sold in the market. The detection device is characterized in that the detection device comprises a base plate, a rotation disc rotatably connected to the base plate, an Archimedes screw groove arranged in the rotation disc, multiple slide sleeves which are fixed on the base plate and arranged along the circumferential direction of the rotation disc, and spreading rods slidably inserted in the slide sleeves; one end of each spreading rod slides in the Archimedes screw groove and the other end is opposite to the rotation disc; a light source is fixed on the base plate; and by rotating the rotation disc, the Archimedes screw groove pushes the spreading rods to slide in a reciprocating manner along the slide sleeves. Thus, it is achieved that whether bead sheets are omitted is rapidly detected by using the light source to give out light after the a piece of clothes is spread by use of the Archimedes screw groove to push the spreading rods.