Longitudinal beam profiling and splicing device

The invention provides a semitrailer longitudinal beam profiling and splicing device which comprises a bottom frame, a plurality of longitudinal beam jacking assemblies, fish belly spinning assemblies and goose neck spinning assemblies are arranged on one side in the width direction of the bottom frame, and a goose neck spinning assembly and a plurality of longitudinal beam fixing check blocks are arranged on the other side in the width direction of the bottom frame. The longitudinal beam jacking assembly comprises an air cylinder and a jacking plate. Each of the fish belly spinning assembly and the goose neck spinning assembly comprises a spinning cross beam, a fixed end oil cylinder, a spinning end oil cylinder and a top head arranged on the spinning cross beam, and the two ends of the spinning cross beam are hinged to telescopic rods of the spinning end oil cylinder and the fixed end oil cylinder respectively; the gooseneck spinning assembly comprises a profiling mold arranged on one side of the bottom fra