The invention discloses a quantitative feeding device of a rare earth magnetic powder pressing automatic production line. The quantitative feeding device of the rare earth magnetic powder pressing automatic production line comprises a feed adjusting mechanism, an electronic metering mechanism, a feeding mechanism and a base, wherein the feed adjusting mechanism and the electronic metering mechanism are jointly arranged on the same cross beam; a discharge opening of the feed adjusting mechanism corresponds to an overturning hopper of the electronic metering mechanism; the discharge speed of the feed adjusting mechanism is adjusted through the electronic metering mechanism; a discharge opening of the electronic metering mechanism corresponds to a feeding hopper of the feeding mechanism; a guide track of the feeding mechanism is assembled with the base; and one end of the base is connected with a stand column of an existing magnetic powder press. By the device, a series of continuous actions such as loading, weighing, feeding and scraping can be finished. Automatic quantitative feeding can be realized under a stable, orderly, accurate and reliable working state. A rooting structure of the base of the device can be tightly combined to the stand column of the existing semi-automatic magnetic powder press, and the existing semi-automatic magnetic powder press can be improved and upgraded well.