Liquid layering accurate sampling device

A cleaning mechanism comprises a fixing sleeve, a first groove is formed in the bottom of the fixing sleeve, a sponge block is arranged in the first groove, the interior of the sponge block is connected with the outer surface of a needle cylinder in a sliding mode, a sliding groove is formed in the top of the fixing sleeve, and the sponge block is arranged in the sliding groove. And the interior of the chute is matched with the outer surface of the needle cylinder. The utility model relates to the technical field of liquid sampling equipment. According to the liquid layering accurate sampling device, through cooperative use of the fixing sleeve, the first groove, the sponge block, the sliding groove, the fixing assembly, a connecting body, a second groove and a through hole, each sampling device can independently clean liquid, the operation is simple and convenient, and the problems that when an existing sampling device is used for sampling, a pumping cylinder is stained with liquid, the environment is pollut