The invention discloses an automatic apparatus used for detecting foreign matters in soft-bag infusion. The frame of the apparatus is provided with three cyclically-conveying synchronous belts; all the cyclically-conveying synchronous belts are provided with material hanging plates; a bag feeding and conveying device is connected with a bag receiving disc; the frame of the apparatus is provided with a detection device; the detection device comprises a clamping and turning unit; a light source group is arranged before the clamping and turning unit, and a camera group is arranged behind the clamping and turning unit; a bag receiving conveyer belt is arranged below the clamping and turning unit and connected with a bag discharging and conveying device; the clamping and turning unit comprises a sleeve mounting plate; the sleeve mounting plate is provided with a circular hole; a rotary sleeve is arranged in the circular hole; transparent glass is arranged in the rotary sleeve; a reciprocatingly-moving pressure plate is arranged in front of the rotary sleeve; a rotary circular ring is arranged in the circular hole in the reciprocatingly-moving pressure plate; transparent glass is arranged in the rotary circular ring; and the reciprocatingly-moving pressure plate is connected with a linear reciprocating mechanism. The automatic apparatus provided by the invention can accurately and efficiently detect whether soft-bag preparations have foreign matters or not and is fast in detection speed, high in precision and good in versatility.