Underwater concrete pile head sampler of steel pipe cast-in-place pile for high platform

The utility model provides an underwater concrete pile head sampler of a steel pipe cast-in-place pile for a high platform, which comprises a shaft part and a sampling part, the shaft part comprises a cylinder bottom water-stop sheet, a suspender fixed on the end face of the cylinder bottom water-stop sheet, and a counterweight head fixed on the other end face of the cylinder bottom water-stop sheet; the sampling part comprises a sampling barrel which is positioned above the barrel bottom water-stop sheet and is arranged close to the opening of the head end of the counterweight, and the sampling barrel is provided with a sampling barrel inner wall, a sampling barrel outer wall, a sampling barrel inner wall and a sampling barrel outer wall which are coaxially arranged with the suspender; the annular connecting plate is fixed on the inner wall of the sampling barrel, and the outer wall of the sampling barrel is far away from one end of the counterweight head; two ends of the inner wall of the sampling barrel ar