Telescopic beam, telescopic chassis and vehicle

The invention discloses a telescopic beam, a telescopic chassis and a vehicle, and solves the technical problem that a beam used on a chassis in the prior art is a fixed beam and cannot meet the requirements of variable vehicle types. The telescopic beam is of a split structure and is formed by connecting the first beam section and the second beam section. The first beam section is provided with a plurality of first connecting parts with different lengths and parallel axes, the second beam section is correspondingly provided with a plurality of second connecting parts with different lengths and parallel axes, and the first connecting parts and the second connecting parts are the same in number and are in one-to-one correspondence in position, so that a complete beam structure is formed. According to the telescopic beam, the multiple first connecting parts/second connecting parts with the axes parallel to one another are arranged, different lengths are obtained through different connecting schemes of the first