PH value detection device for water quality detection

The utility model discloses a PH value detection device for water quality detection, which comprises a fixed frame, a cylinder I, a cylinder II and a cylinder III are arranged above the fixed frame, the tops of the cylinder I, the cylinder II and the cylinder III are respectively provided with a detection pen, each detection pen is connected with a transmission rod, the tail end of each transmission rod is provided with a support frame, the support frame is provided with a controller, and the controller is connected with the cylinder I, the cylinder II and the cylinder III. A display screen is arranged on the controller; a driving gear is arranged on a motor transmission shaft and is in meshed connection with a first gear, and the first gear is in meshed connection with a second gear; a motor transmission shaft penetrates through the bottom end face of the first barrel to reach the top of the first barrel, a first transmission rod and a second transmission rod are arranged on the first gear and the second gea