Sinking type greenbelt multifunctional overflow well

The utility model provides a sinking type greenbelt multifunctional overflow well. The overflow well comprises an overflow well body arranged in the center of the sunken greenbelt. The sunken green land sequentially comprises an original soil layer, a gravel layer, a sandy soil layer and a planting soil layer from underground to top. the lower end of the overflow well body is buried in the original soil layer; the upper end of the overflow well body extends out of the planting soil layer; a filter well lid is arranged at a well mouth of the overflow well body, a water collecting pipe is further buried in the gravel layer, the water collecting pipe is connected and communicated with the side wall of the overflow well body, a drainage port is further formed in the position, close to the top,of the side wall of the overflow well body, and a drainage pipe is connected to the drainage port. According to the technical scheme, impurities can be prevented from entering the overflow well bodythrough the arrangement of