The utility model discloses a sucking disc formula slot signboard, including the tablet body, the draw -in groove body and sucking disc, the tablet body is including erecting tablet, horizontal tablet and indulging the tablet, it connects at horizontal tablet medial extremity at perpendicular tablet upper end, the other end to indulge the one end connection of tablet, horizontal tablet is perpendicular on the space with perpendicular tablet, be equipped with marking layer on the horizontal tablet, the draw -in groove body is equipped with and is used for supplying to erect the vertical slot of placing that inserts of tablet, sucking disc and draw -in groove body fixed connection, the utility model discloses a sucking disc formula slot signboard can not shelter from other operation equipment, effectively avoids the maintainer to the misjudgement of on -the -spot measure, improves level of safety.