Dropper

The dropper comprises a dropper body, a dropper head and a support, the dropper body is connected with the dropper head through the support, a cavity with an opening in one side is arranged in the dropper body, the dropper head can be installed at the opening position of the cavity of the dropper body, the support is located at the opening position of the cavity in the dropper body, the interior of the dropper head is communicated vertically, and a sealing film is arranged on one side of the opening of the cavity. The tube body is elastic; wherein a puncturing structure is arranged on the water dropper. The dropper comprises the detachable dropper head, samples/reagents can be stored in the cavity when liquid dropping is not needed, and the dropper head is installed when liquid dropping is needed. Meanwhile, a piercing structure is arranged on the water dropper and can pierce the sealing film, so that the water dropper can be directly mounted on the pipe body under the condition that the sealing film is not t