Hydrologic monitoring device

The invention discloses a hydrologic monitoring device. According to the device, a water sample collection bucket of a water sampling mechanism is divided into multiple water sample storage cavities provided with water inlets, and each water inlet is provided with a sealing gate; a rotary shaft penetrating through all the water sample storage cavities is further arranged on a longitudinal center line of the water sample collection bucket, a deflector rod fixedly connected with the rotary shaft is arranged in each water sample storage cavity, and when the end of each deflector rod rotates to the corresponding sealing gate, the corresponding sealing gate exactly can be ejected open; and the part, extending out of the water sample collection bucket, of the upper end of the rotary shaft is provided with a sleeve in a sleeved mode, the lower end of the sleeve is fixed to the water sample collection bucket, the rotary shaft is in axis connection with an axis center of a flexible shaft, the upper end of the sleeve i