An optical coherence tomography device, comprising: a base wherein a first end of the base is provided with a detection end, and a second end of the base is provided with a mounting end; an optical imaging catheter is coaxially connected to the detection end; the optical imaging catheter is configured to move along a length direction of the base; the optical imaging catheter is provided with an imaging end and a connecting end, wherein the connecting end is removably connected to the detection end, and the connecting end is provided with a first connecting part; a movable base mounted at the mounting end and the movable base is configured to move toward or away from the detection end along the length direction of the base; the movable base is provided with a fiber optic rotary joint configured to transmit optical signals, a hollow shaft and a first drive mechanism; the fiber optic rotary joint is set away from the detection end, and the fiber optic rotary joint is fixedly connected to the movable base; an end of the fiber optic rotary joint is adjacent to the detection end, and the end of the fiber optic rotary joint extends into the hollow shaft; the hollow shaft is coaxially connected to the movable base, and an end of the hollow shaft adjacent to the detection end is provided with a second connecting part; when the movable base moves toward the detection end, the second connecting part is configured to be connected to the first connecting part, and the optical imaging catheter is coupled with the hollow shaft to connect the optical imaging catheter to an optical path of the fiber optic rotary joint; the first drive mechanism is configured to drive the hollow shaft to rotate; and a second drive mechanism configured to drive the movable base to move along the length direction of the base characterized in that the fiber optic rotary joint, the hollow shaft and the optical imaging catheter are coaxially connected on the base, the movable base is provided with two mounting holes that are coaxially formed, in which the fiber optic rotary joint and the hollow shaft are mounted, the detection end of the base is provided with a mounting hole in which the optical imaging catheter is mounted, and the mounting hole is coaxial with the two mounting holes. a base wherein a first end of the base is provided with a detection end, and a second end of the base is provided with a mounting end; an optical imaging catheter is coaxially connected to the detection end; the optical imaging catheter is configured to move along a length direction of the base; the optical imaging catheter is provided with an imaging end and a connecting end, wherein the connecting end is removably connected to the detection end, and the connecting end is provided with a first connecting part; a movable base mounted at the mounting end and the movable base is configured to move toward or away from the detection end along the length direction of the base; the movable base is provided with a fiber optic rotary joint configured to transmit optical signals, a hollow shaft and a first drive mechanism; the fiber optic rotary joint is set away from the detection end, and the fiber optic rotary joint is fixedly connected to the movable base; an end of the fiber optic rotary joint is adjacent to the detection end, and the end of the fiber optic rotary joint extends into the hollow shaft; the hollow shaft is coaxially connected to the movable base, and an end of the hollow shaft adjacent to the detection end is provided with a second connecting part; when the movable base moves toward the detection end, the second connecting part is configured to be connected to the first connecting part, and the optical imaging catheter is coupled with the hollow shaft to connect the optical imaging catheter to an optical path of the fiber optic rotary joint; the first drive mechanism is configured to drive the hollow shaft to rotate; and a second drive mechanism configured to drive the movable base to move along the length direction of the base characterized in that the fiber optic rotary joint, the hollow shaft and the optical imaging catheter are coaxially connected on the base, the movable base is provided with two mounting holes that are coaxially formed, in which the fiber optic rotary joint and the hollow shaft are mounted, the detection end of the base is provided with a mounting hole in which the optical imaging catheter is mounted, and the mounting hole is coaxial with the two mounting holes.