Sampling device for pharmaceutical experiments

According to the utility model, the adjusting tube and the limiting component are arranged on the sampling tube, and the coarse adjusting scale and the fine adjusting scale are matched with each other, so that the accuracy of the device reaches 0.01 ml, the adjusting tube moves forwards or backwards by 0.1 scale on the sampling tube along the coarse adjusting scale every time the adjusting tube rotates by a circle, and the 0.1 scale is equivalent to 0.1 ml in the sampling tube; the 0.1 scale of the coarse adjustment scale is averagely divided into ten equal parts by the fine adjustment scale, so that the accuracy of the device is greatly improved; besides, by rotating an adjusting pipe, the adjusting pipe can drive a limiting rod to move up and down in a rotating groove so as to drive a first limiting plate to move up and down in the sampling pipe, so that the volume between the first limiting plate 32 and the bottom wall of the sampling pipe 10 is the volume of the reagent to be extracted, and the first limi