Water source quality monitoring and sampling equipment

The invention relates to the technical field of water quality detection sampling, and discloses a floating plate, a hollow round rod, a supporting plate, a first rotating rod, a second rotating rod and a graduated scale, the supporting plate is fixedly installed at the top end of the floating plate, the hollow round rod is slidably installed in the middle of the top end of the supporting plate, and the first rotating rod is rotatably installed on the annular side face of the hollow round rod. A second rotating rod is rotationally installed at the top end of the supporting plate, one end of the first rotating rod is rotationally connected with the second rotating rod through a cylindrical pin, and a graduated scale is fixedly installed on the annular side face of the hollow round rod. According to the invention, the screw rod rotates to drive the support rod to move so as to realize downward movement of the hollow circular tube and realize the function of sampling at different depths, the rack moves to drive t