Low-flow-velocity vacuum blood collection tube

The utility model discloses a low-flow-speed vacuum blood collection tube which comprises a tube body, a rubber plug and a protective cover. An annular limiting step is arranged on the inner wall of the pipe body, and multiple circles of annular comb teeth are arranged on the inner wall, below the annular limiting step, of the pipe body from top to bottom. The rubber plug comprises an upper part and a lower part, the lower part of the rubber plug is in close contact with the inner wall below the annular limiting step of the pipe body, the upper part of the rubber plug partially extends out of the pipe body, and the upper part of the rubber plug extending into the pipe body is in close contact with the inner wall above the annular limiting step of the pipe body; and the protective cover covers the rubber plug outside the tube body and is clamped with the rubber plug. According to the utility model, the plurality of circles of annular comb teeth are arranged on the inner wall of the tube body, so that blood ent