The utility model discloses a sampling needle which comprises an inner needle body and an outer needle body. The tail end of the inner needle body is connected with an inner needle tube through adhesives, the tail end of the outer needle body is connected with an outer needle tube through adhesives, the inner needle body and the inner needle tube are arranged in the outer needle body and in the outer needle tube respectively, an outer sleeve is arranged on the outer side of the outer needle tube, the near end of the outer sleeve is connected with an outer sleeve handle through adhesives, the front portion of the outer sleeve handle is connected with the outer sleeve through adhesives, the tail portion of the outer sleeve handle is provided with an outer needle thread hole, an outer needle locking cap is arranged in the outer needle thread hole, the end face of the outer needle locking cap is provided with an outer needle sealing ring used for fixing the outer needle tube, the outer needle tube penetrates through the outer sleeve handle, the outer needle sealing ring and the outer needle locking cap, the near end of the outer needle tube is connected with the outer needle handle, the tail portion of the outer needle handle is provided with an inner needle thread hole, an inner needle locking cap is disposed in the inner needle thread hole, the end face of the inner needle locking cap is provided with an inner needle sealing ring used for fixing the inner needle tube, and the inner needle tube penetrates through the outer needle handle, the inner needle sealing ring and the inner needle locking cap.