The invention relates to a micro-scale sampling pump art sphere for transferring microliter liquid as using in medical devices and laboratory automatic devices, which is a gas replacing type and with an auto-removing suction
nozzle device and comprises a pump body, a
linear motor, a driving guide screw, a
piston, a sliding sleeve, a cylinder, a gun end and a suction
nozzle removing sleeve, wherein the sliding sleeve, the cylinder and the gun end are connected together one by one, and the suction
nozzle removing sleeve is fixed on the pump where is close to the gun end. The one-time suction nozzle of the invention is used as the air replacing type micro-scale sampling pump for transferring
liquid medium, which resolves the questions of the requirement of complicated washing
pipe and cross
contamination, and also can acutely detect height of the liquor and the suction nozzle fitting tightly or not and being caught or not. Compared with the expensive huge-scale liquid working stations abroad, the invention has the superiority in cost and avoids the cross
contamination between specimens.