Underground regulating reservoir with overflow structure

The utility model discloses an underground regulating reservoir with an overflow structure, which comprises a regulating reservoir cavern arranged below the earth surface and an overflow tunnel communicated with the regulating reservoir cavern, the overflow tunnel is fixedly connected to the upper half part of the regulating reservoir cavern and extends towards the direction deviating from the regulating reservoir cavern, and an overflow weir is arranged in the overflow tunnel. According to the utility model, the overflow tunnel is additionally arranged on the adjusting pool cavern of the underground adjusting pool and is used for draining water from the adjusting pool cavern, and when the water inflow of the underground adjusting pool exceeds the limit of the highest water level of the adjusting pool cavern, excessive water can overflow into the overflow tunnel from the overflow dam and is discharged through the overflow tunnel; the overflow weir can prevent the water body in the overflow tunnel from flowing