Connecting beam assembly and truss arm system

The invention discloses a connecting beam assembly and a truss arm system with the same. The connecting beam assembly comprises two first arm joints and two second arm joints which are arranged crosswise, one ends of the two first arm joints and the two second arm joints are connected at a first cross position, the two first arm joints are arranged adjacent to each other, and the lengths of the two first arm joints are adjustable. By using the connecting beam assembly and truss arm system disclosed by the invention, the stress ability of a truss arm can be improved, and the integral stability of the truss arm system can be increased; and the connecting beam assembly and the truss arm system are simple in structure, low in cost, easy to adjust, convenient to install and high in installation precision.