Aluminum alloy saloon car B column

The utility model discloses an aluminum alloy saloon car B column, which comprises an outer plate, an inner plate and a B column body. The B column body is at least composed of two sections in split connection mode. The B column body is designed to be of a multi-section split connection structure, resolves the problem that aluminum alloy materials cannot be used in formation due to the fact that the B column body is large in flexibility, and is simple in structure, convenient to install and light in weight. Simultaneously, the upper section and the lower section of the body are respectively and internally provided with reinforcing ribs to improve strength. The number of the reinforcing ribs can be designed according to actual requirements.