The invention discloses a detection device for a tube target inner wall. The detection device comprises a foundation support and a motor, the two sides of the foundation support are provided with longitudinal first rails, the first rails are provided with a rail frame, a main shaft is fixedly arranged on the rail frame, the main shaft is provided with a detector conducting transverse movement along the main shaft, one end of the main shaft is fixedly connected with a universal connection rod, the other end of the universal connection rod is fixedly connected with a gear, a foundation support is provided with a second rail corresponding to the end of the universal connection rod, the gear is arranged on the second rail, the universal connection rod pushes the gear to roll on the second rail, the inner side of the gear is fixedly provided with a coupling rod, the other end of the coupling rod is fixedly connected with an outer ring sleeve, the outer ring sleeve is arranged on the outer wall of one side of a tube target in a sleeving mode, and the outer ring sleeve drives the tube target to rotate through rolling of the gear. By means of the detection device, whether the inner wall of the tube target is evenly coated with glue or not and whether adhesion is firm or not can be detected.