Automatic ink supply writing brush capable of adjusting ink output amount

The invention discloses an automatic ink supply writing brush capable of adjusting the ink output amount. The automatic ink supply writing brush is composed of a brush sleeve, a balancer, an adjuster,an ink bag, a decoration tail cap and a writing brush head, wherein a sealing ring is arranged in the brush sleeve; the balancer is located between the adjuster and the writing brush head and composed of a flow guide column, an ink guide balance groove, an ink uniformizing ring, an ink stopping ring, an adjusting valve cavity, a positioning base and a neck locking ring; the adjuster is composed of an adjusting valve, a brush holder base and an ink guide rod; the adjusting valve is composed of an adjusting valve element, an air return ring, a sealing ring, a fixing ring, a neck locking grooveand a positioning tongue; the ink bag is composed of a connector and a brush holder; the decoration tail cap is a sealing piece of the connector; and an opening sealing ring is designed at the bottomof the decoration tail cap.