Rotary table and big arm connecting structure

The utility model discloses a rotary table and big arm connecting structure which comprises two first lug plates arranged on a rotary table in a spaced mode and two second lug plates arranged on a big arm. The first lug plates correspond to the second lug plates in a one-to-one mode, and the first lug plates are hinged to the corresponding second lug plates. The hinge pin is applied to the technical field of engineering machinery, the first lug plate and the second lug plate which correspond to each other are arranged on the rotary table and the large arm respectively, and therefore the rotary table and the large arm can be connected through the two short hinge pins. The reliability and the stability of connection between the rotary table and the large arm can be effectively improved, and the risks of maintenance and damage are reduced. In addition, in the application process, the connecting rod between the large arm and the rotary table is hidden in the inner side of the large arm instead of being arranged o