The invention discloses a small-size drilling machine with precise measurement. The small-size drilling machine comprises a drilling machine box body, wherein a processing groove is formed in the bottom of the drilling machine box body; a sliding chute is formed in the bottom end of the drilling machine box body; a measuring rod is mounted in the sliding chute in a sliding manner; a groove is further formed in one side of the bottom of the drilling machine box body; a pointer for indicating scales of the measuring rod is mounted on the inner wall of the top of the groove; a motor is mounted in the drilling machine box body; and a drill bit is mounted at the lower end of the motor. The small-size drilling machine can precisely position and firmly fix a to-be-processed part, is compact in structure and convenient to use and can be widely used and popularized.