The utility model discloses a motor shaft screw thread size optics automatic measure machine, include: the blowing system waits that the motor shaft who detects arranges in in the blowing system, station portion, it includes that one detects the station, station portion with the blowing system meets, motor shaft by conveyed in the blowing system detect on the station, the formation of image detects control system, and should forming images, it is right to detect control system detect on the station the measuring forms images after motor shaft takes, receive the material system, it is located the end of station portion is treated it is right that the formation of image detects control system will after motor shaft detects and finishes motor shaft transmits and gives receive the material system and distinguish the recovery. The utility model discloses a motor shaft screw thread size optics automatic measure machine has realized quick, automatic measure, the automatic separation of motor shaft screw thread, has improved the efficiency that detects, makes the product examine the enable entirely.