Constructed wetland water level warning device

The invention relates to the technical field of constructed wetlands and discloses a constructed wetland water level warning device. The constructed wetland water level warning device comprises connecting rods, wherein metal nets are fixedly connected among the connecting rods, a middle plate is fixedly connected between the metal nets at the front part and the rear part, the middle plate is fixedly connected with a floating plate by virtue of a ball, the right side of the metal net at the right part is fixedly connected with a fixed plate, a motor switch is fixedly arranged on the fixed plate, a fixed column is arranged at the left side of the fixed plate, the fixed column is hinged with a movable plate, the upper right end of the movable plate is fixedly connected with an extrusion block, the fixed plate is connected with a base plate by virtue of a connecting plate, a rotary plate is arranged on the base plate, a knocking ball is arranged above the rotary plate, and a small bell isarranged outside the knoc