The invention discloses an underground floating parking space capable of preventing flood inundation. The underground floating parking space capable of preventing flood inundation comprises a floatingplate, fixed columns, fixed rods, a floating plate receiving groove and a floating plate water-isolation cover, wherein the floating plate is a hollow cuboid and the fixed columns are fixedly connected to the surrounding above the floating plate; each fixed column is a cuboid and a clamping hole is formed in the middle of the fixed column; and one fixed rod is movably clamped into each clamping hole. According to the underground floating parking space capable of preventing flood inundation, through a parking space design capable of floating up and down, the parking space is enabled to float through the buoyancy of water when flood pours into an underground garage; and then water is stopped outside the floating plate through a buoyancy water-isolation plate, and therefore is prevented fromentering a vehicle.