Underframe fireproof floor structure for rail vehicle and preparation method thereof

The invention discloses an underframe fireproof floor structure for a rail vehicle and a manufacturing method thereof. The underframe fireproof floor structure for the rail vehicle comprises a bottomload bearing frame and a floor laid on the bottom load bearing frame; the bottom load bearing frame is integrally welded by using carbon steel and comprises a rectangular external frame and a plurality of cross beams; hat-shaped fireproof plates with downward tops are arranged between the two adjacent cross beams; the two side walls of the hat-shaped fireproof plates are clamped between the two adjacent cross beams; the two edges of the hat-shaped fireproof plates are correspondingly and integrally bonded with the upper surfaces of the two adjacent cross beams; the tops of the hat-shaped fireproof plates are positioned above the lower surfaces of the cross beams; the floor is connected with each cross beam by using a gluing mode; and cold-proof and heat insulation materials are arranged between the floor and the h