Flat car connecting device

The invention discloses a flat car connecting device which is safe and convenience for use. The device comprises a shell, wherein the shell is hollow; the shell has a forward opening; the shell comprises a top wall and a bottom wall; a pin hole is formed on the top wall of the shell; a limiting hole is formed on the bottom wall of the shell; the pin hole and the limiting hole correspond to each other up and down, and a pin shaft passes through both the pin hole and the limiting hole; the upper end of the pin shaft is fixedly connected with a pin cap which is integrated with the pin shaft; thepin cap is positioned on the top wall of the shell; and a polyester buffering block which has a 'U'-shaped structure is arranged in the shell, and the opening of the groove of the polyester bufferingblock is positioned outside the shell. The limiting hole is shaped like a Chinese character 'zhong', the lower end of the pin shaft is fixedly connected with a limiting pin which is integrated with the shaft pin and corresponds to the limiting hole. The bottom side of the bottom wall of the shell is fixedly connected with a limiting plug, the side wall of the limiting plug has a limiting groove, and one end of the bottom wall of the limiting groove is higher than the other end of the bottom wall of the limiting groove.