The utility model discloses a device for automated inspection cigar size, include with mount and detection device, the cigar mount sets up with detection device relatively, detection device includes the ring gage fixed plate, clamping device and support, the ring gage fixed plate sets up on the support through clamping device, ring gage fixed plate and perpendicular setting of cigar of treating the detection, compared with the prior art, the other pressure sensor that all is provided with in each ring gage hole, pressure sensor's output is connected with central processing unit, the support includes base and U type slide rail, the fixed setting on the base in bottom of U type slide rail, the both sides limit and the perpendicular to the ground of U type slide rail set up, the stiff end of telescopic link slides and sets up in U type slide rail. The utility model discloses simple structure can accurately detect the ring footpath and the length of the cigar waiting to detect, and the testing result is accurate, need not manual operation, and labour saving and time saving has improved cigar size detection's efficiency greatly.