Liquid chromatograph

The utility model relates to an analysis and detection instrument for chemical substances, and particularly relates to a liquid chromatograph. The liquid chromatograph comprises a liquid container, a liquid feeding device and a detection device, wherein a liquid suction pipe of the liquid feeding device is communicated with an inner cavity of the liquid container through a pipeline; a liquid outlet pipe of the liquid feeding device is communicated with a liquid inlet pipe of the detection device. The liquid chromatograph is characterized in that the liquid feeding device comprises a housing, two sealing covers fixedly connected with the interior of the housing through a bracket, and a rotatable quantitative tube clamped arranged between the two sealing covers; the quantitative tube is in a shape of a sealing housing. With the structure, the liquid chromatograph disclosed by the utility model is provided with an automatic liquid inlet device, manpower is replaced, the stability is relatively high, the liquid i