Test tube and test tube anti-overflow interpretation method

The test tube comprises a tube body and a tube cap, the tube cap is provided with a first connecting part, at least part of the structure of the first connecting part is transparent or semitransparent, and a first identification piece is arranged at the transparent or semitransparent position of the first connecting part; the pipe body is provided with a second connecting part, a second marking piece is arranged on the second connecting part, when the second connecting part is tightly connected with the first connecting part, the second marking piece is located in a transparent or semitransparent area on the first connecting part, and the structures of the second marking piece and the first marking piece in the preset direction can coincide or just abut against each other. By arranging the first connecting part on the pipe cap to be transparent or semitransparent, when the pipe cap and the pipe body are screwed, whether the position relation between the first marking piece and the second marking piece meets t