Axle body structure of trailer axle

The utility model discloses an axle body structure of a trailer axle, which comprises a first axle body, two second axle bodies symmetrically arranged on two sides of the first axle body, and two brake assemblies respectively arranged on two sides of the second axle bodies, the two second shaft bodies are symmetrically arranged on the two sides of the first shaft body and are preliminarily connected with the first shaft body through inserting assemblies, two protruding blocks are symmetrically and fixedly connected to the side wall of the first shaft body, and the two protruding blocks are connected with the opposite inserting assemblies through locking assemblies correspondingly; and the second shaft body is further connected with the first shaft body. The connecting structure is reasonable in structural design, the first shaft body and the second shaft body can be stably connected, in the running process of a vehicle, the T-shaped plate slides in the hollow shell and is matched with the spring to achieve th