Steel structure welding seam detection device

The utility model discloses a steel structure welding seam detection device which comprises a structure base, the bottom end of the structure base is fixedly connected with a connecting support, the bottom ends of the two sides of the connecting support are respectively and fixedly connected with a rotating outer shaft, and the interior of the rotating outer shaft is rotatably connected with an axis shell. Buffering pieces are fixedly connected to the bottoms of the ends, away from each other, of the axis shells on the two sides correspondingly, a connecting platform is fixedly connected to the bottom ends of the buffering pieces, auxiliary wheels are rotationally connected to the bottom end of the connecting platform, and a coupling agent storage tank is fixedly connected to the top end of the structure base. A coupling agent is sprayed to a welding seam through a coupling agent spray head before ultrasonic detection, the coupling agent is accurately sprayed to the surface of the welding seam, the use of the