Blood collection tube for direct assembly detection

The invention belongs to the technical field of blood collection tubes, and particularly relates to a blood collection tube for direct assembly detection. The blood collection tube comprises a tube body, a tube opening of the tube body is provided with a sealing component, and the sealing component comprises an inner plug, an inner plug clamping ring, an outer protecting ring and an outer plug; the outer protecting ring sleeves the upper end of the tube body, the inner wall of the upper portion of the outer protection ring is provided with a first step protruding inwards, and the first step isin contact with the end face of the tube opening; the inner plug is plugged at the tube opening of the tube body, and the outer edge of the upper end of the inner plug is provided with a second stepwhich protrudes outwards; the lower end face of the second step is in contact with the first step, and the inner plug clamping ring is sleeved with the inner plug; the outer edge of the upper end of the inner plug clamping rin