Floor structure of aluminum alloy carriage type transport semitrailer

The invention discloses a floor structure of an aluminum alloy carriage type transport semitrailer and belongs to semitrailers. The floor structure comprises a first profile, a plurality of second profiles, a plurality of third profiles, a fourth profile and a fifth profile, wherein the second profiles and the third profiles as well as the fourth profile and the fifth profile are bilaterally symmetric in shape. The second profiles are mutually connected, the rightmost second profile is connected with the left side of the first profile, the third profiles are connected mutually, the leftmost third profile is connected with the right side of the first profile, the fourth profile and the fifth profile are connected with the leftmost second profile and the rightmost third profile respectively, the first profile, the second profiles, the third profiles, the fourth profile and the fifth profile respectively comprise a first flat plate, second flat plates, third flat plates, a fourth flat plate and a fifth flat plate and a plurality of first to fifth reinforcing ribs arranged below the flat plates correspondingly, and the adjacent profiles are connected through male and female inserts at ends. The floor structure is light in weight, free of rust and high in carrying capacity, the service life of the carriage is prolonged, connection is convenient, connection parts are high in strength and no easy to deform, and materials can be recycled.