The invention provides a liquid collector, which comprises a liquid fetch piece, a connecting piece and a liquid storage pipe. The liquid fetch piece and the liquid storage pipe are detachably connected through the connecting piece. The liquid fetch piece is provided with a liquid fetch cavity. The connecting piece comprises a connecting pipe. The liquid storage pipe is provided with a liquid storage cavity. The liquid fetch cavity and the liquid storage cavity are communicated with each other through the connecting pipe. According to the liquid collector, the liquid fetch cavity of the liquid fetch piece receives a liquid, and the liquid flows into the liquid storage cavity of the liquid storage pipe through the connecting pipe. The liquid fetch process requires no manual liquid pouring. The operation is simple, and sprinkling and leakage of the liquid are avoided so as to avoid from polluting the outer wall of the liquid storage pipe. After the liquid is collected, the liquid storage pipe and the liquid fetch piece are separated, and the liquid storage pipe is then sent for detection. The liquid collector is very convenient. In addition, with the setting of a quantitative control piece, it is very convenient to obtain a quantitative amount of liquid, and reserved sample amount of the liquid is accurate. Thus, it is convenient for subsequent detection.