The invention relates to the technical field of engineering automation, in particular to an automatic connection structure. The automatic connection structure comprises a three-position rotary table and two assembly working platforms. The three-position rotary table comprises a rotary three-position operating platform. The three-position operating platform comprises two tool arrangement platform bearing areas arranged symmetrically and a robot feeding and discharging platform arranged on the symmetric line between the two tool arrangement platform bearing areas. The bottoms of the edges of theouter sides of the tool arrangement platform bearing areas are provided with convex blocks. The two assembly working platforms of tool arrangement platforms are quite suitable for being connected with the two tool arrangement platform bearing areas. Push rods capable of moving in the length direction of the assembly working platforms are arranged on the assembly working platforms. The push rods are suitable for extending to the three-position operating platform from the corresponding assembly working platforms in the moving process. A pair of limiting parts suitable for allowing the corresponding convex blocks to be embedded in to conduct limiting is arranged at the movable end of each push rod. The automatic connection structure provided by the invention is high in automatic efficiency and high in connecting operation stability.