The invention discloses a microminiature feeding and discharging valve. The microminiature feeding and discharging valve comprises a shell, a valve element and an adapter. The valve element penetrates the shell, one end of the valve element ejects the inner wall of the shell, the other end of the valve element is attached to the adapter, the part between the shell and the valve element is sealed through sealing rings, and the valve element is airtight through a stopper. According to the microminiature feeding and discharging valve, by means of cooperation of the shell and the valve element, the size of the feeding and discharging valve is reduced, and the problem that a traditional feeding and discharging valve is large in size is solved; by means of cooperation of the valve element and the adapter, the structure of the feeding and discharging valve is optimized, and the defect that the traditional feeding and discharging valve is complex in structure is overcome; and by means of arrangement of the sealing rings and the stopper, the sealing effect of the feeding and discharging valve is enhanced, and the problem that the traditional feeding and discharging valve is low in sealing performance is solved.