Micro-pipettor

The utility model relates to the technical field of liquid detection, in particular to a micropipettor, which can adjust a limiting block according to the dosage of detection liquid sucked into a suction tube through the arrangement of the micropipettor, so that the limiting block limits a moving plate, and the dosage of the detection liquid sucked into the suction tube is convenient to control. Comprising a suction pipe, a liquid guide head, a moving block, a sliding rod, a moving plate and a limiting device, the bottom end of the suction pipe is communicated with a liquid guide hopper, the output end of the liquid guide hopper is connected with the input end of the liquid guide head, and the moving block slides in the suction pipe; the limiting device comprises a shell, a screw rod, a sliding block, a limiting block, a threaded sleeve, a first bevel gear, a second bevel gear and a rotating shaft, the threaded sleeve is in threaded connection with the screw rod, the first bevel gear is installed at the botto