Hydrological monitoring well water level observation device

The utility model provides a water level observation device for a hydrological monitoring well, relates to the technical field of water level measurement, and solves the problems of inconvenience in use and poor adaptability of the conventional underground water level survey device. A floating ball is arranged in the main measuring tube; a waterproof push switch is fixedly mounted on the inner side of the top of the main measuring tube; a lower protective shell is mounted on the outer side of the bottom of the main measuring tube in a threaded screwing manner; the outer side of the top of the main measuring tube is provided with an upper protective shell in a screwed mode through threads. The inner side of the top of the upper protective shell is fixedly connected with a spring wire, and the top end of the spring wire is communicated with the bottom end of the measuring cable; and the bottom end of the spring wire is fixedly connected with a connecting plug. The sandy soil can fall onto an annular inclined pl