Feed liquid sampler

The utility model discloses a feed liquid sampler which comprises a barrel body, a first feed cavity and a second feed cavity which are arranged up and down and are communicated with each other are formed in the barrel body, a feed port is formed in the bottom of the second feed cavity, a movable block capable of sealing and blocking the feed port is arranged in the second feed cavity, and a control piece is arranged in the barrel body. And the other end of the control piece penetrates out of the upper end of the cylinder body. According to the utility model, the movable block can be driven tolift by lifting the control piece, so that the feeding hole is opened, then the barrel body can vertically extend into the material liquid from top to bottom, and the material liquid at each depth can enter the first material cavity and the second material cavity in the barrel body from the feeding position in the process of vertically extending into the material liquid, so as to realize uniformsampling; only a sample wi