Technology for preventing and controlling underground floods in transitional period from surface mine to underground mine

The invention discloses a technology for preventing and controlling underground floods in the transitional period from a surface mine to an underground mine. The mining stage is divided into a surface mining stage (1), a transition stage (2) from surface to underground and an underground mining stage (3), wherein the transition stage (2) from surface to underground is divided into a linking production middle section (4) and an emergency middle section (5); the interior of the emergency middle section (5) is uniformly divided into rooms (13) and jambs (14); ore bodies on the lower layers of the rooms (13) are firstly extracted; upward drainage wells (6) are excavated in the rooms (13) to communicate with the linking production middle section (4); after extraction of a plurality of rooms (13) in the emergency middle section (5) is completed, places of underground rainwater in the water inrush period are formed; when rainstorm seasons come, rainwater floods into the rooms (13) of the emergency middle section (5), flows into a main sump via a drainage well (12) and then is drained to safe sections of surfaces via a water pump, thus solving the problem of insufficient underground preventing and draining capabilities in the transitional period from the surface mine to the underground mine in rainstorm seasons and providing guarantees for safe transition from the surface mine to the underground mine.