The utility model relates to a detection apparatus for has same circumference appearance part through screening of surperficial character, including following module: the lectotype module for the settlement character that awaits measuring, detection module for scan in order to acquire the signal the workpiece to be tested surface with what certain frequency did not stop, drive module for drive workpiece to be tested carries out rotary motion, control module for to the signal of the collecting processing of comparing, seek whether there is the character that awaits measuring, if detect out the character that awaits measuring in preset's time quantum, show then that workpiece to be tested passes through to detect, if the undetected play character that awaits measuring is then reported to the police in predetermineeing the time quantum, workpiece to be tested is through detecting. The utility model discloses to the appearance, colour part in full accord is through the measuring to surperficial character to can be portably quick and accurate screening is to the part of required model, and the part of the same outward appearance, different models is obscured in the prevention.