The utility model provides a container chassis. The container chassis comprises at least two bottom side beams, a bottom beam and the iron floor; each bottom side beam comprises an upper flange plate and a web plate which is fixedly arranged on the upper flange plate vertically; the bottom beam is fixedly connected between the bottom side beams; the iron floor is paved on the bottom beam and fixedly connected with the bottom beam and the bottom side beams; two ends of the bottom beam are provided with shoulder-shaped gaps which comprise the first edges and the second edges which are connected with each other; the first edges are located under the bottom surface of the upper flange plate; the second edges are located on the lateral side of the upper flange plate; gaps are formed between the first edges and the bottom surface of the upper flange plate. The connection strength of the container chassis is satisfied, meanwhile gaps of the bottom side beams can be simple, the length of welding joints can be small, unnecessary corner welding joints can be omitted, the welding difficulty is reduced, and the welding quality can be ensured. Meanwhile, the container chassis is beneficial to the subsequent sanding and paint spraying operation and the sanding and paint spraying quality can be guaranteed easily.