The present invention relates to a powder quantitative supply device. According to the present invention, a lower part of a storage container is finished with a powder transfer unit for transferring powder by rotating a transfer wing. A powder distribution device integrally extending from the powder transfer unit and distributing powder by a predetermined amount by a quantitative distribution gear is formed on one side of the powder transfer unit. Also, a driving motor for rotating the transfer wing is formed on a lower surface of the powder transfer unit, and a driving gear driven by receiving rotation power of the driving motor is formed on a lower surface of the powder distribution device. In addition, a belt for transferring driving motor power to the driving gear is formed between the driving motor and the driving gear to supply powder to a storage container, such that the powder is pushed by the transfer wing to be supplied to the powder distribution device, wherein the powder is distributed by a predetermined amount by the quantitative distribution device of the powder distribution device, and is discharged to the outside. According to the present invention, the powder accommodated in the storage container is automatically supplied to the powder distribution device by the transfer wing of the powder transfer unit so an operator does not need to check the amount of the powder supplied to the powder distribution device. Also, the powder is automatically distributed by a predetermined amount by the quantitative distribution gear which is rotatably operated, thereby remarkably reducing an error occurrence rate in the distribution amount of the powder. In addition, the discharge amount of the powder supplied to the feed can be accurately checked by determining the discharge amount of the powder in accordance with the number of revolutions of the quantitative distribution gear. Therefore, the reliability of a product is improved by the convenience of automatically
