Underground water level observation device

The utility model relates to an underground water level observation device which comprises an observation well, a measuring scale is arranged on one side of the upper portion of the observation well, a floating ball is arranged on the lower portion in the observation well, a connecting rod is fixedly connected to the center of the upper portion of the floating ball, a plurality of guide plates are arranged on one side of the outer portion of the connecting rod, and a plurality of balls are arranged on the edges of the guide plates. An extension rod is connected into the connecting rod, a limiting block is arranged at the top end of the extension rod, a pointer is arranged on one side of the limiting block, and a first water guide pipe is connected to the other side of the limiting block. According to the utility model, the guide plate is arranged on the connecting rod, the ball is arranged on the guide plate, and the guide plate and the ball can be supported on the inner wall of the observation well, so that