Labeling equipment suitable for test tubes of different specifications

The utility model relates to labeling equipment suitable for test tubes with different specifications. The test tube labeling device comprises a first conveying belt and a second conveying belt, a first test tube labeling machine is installed on the side wall of the first conveying belt, a second test tube labeling machine is installed on the side wall of the second conveying belt, and a supporting device is arranged on the upper surface of the first conveying belt and the upper surface of the second conveying belt and comprises a conveying frame; the conveying frame is fixedly connected with the upper surface of the first conveying belt and the upper surface of the second conveying belt, conveying rollers are fixedly connected to the side wall of the conveying frame, a mounting plate is slidably connected to the lower surface of the conveying frame, a first screening plate is fixedly connected to the side, away from the conveying frame, of the mounting plate, and screening holes are formed in the surface of