The invention relates to the technical field of vertebral body fusion devices, in particular to a vertebral body fusion device capable of well supporting and fixing a vertebral body. The vertebral body fusion device comprises a first outer shell, a second outer shell, a first sleeve, a second sleeve, a push rod, a first distraction component, a second distraction component and a sliding block component. One end of the first outer shell stretches into the second outer shell. The first sleeve and the push rod are arranged in the first outer shell. One end of the push rod stretches into the first sleeve, the first sleeve is sleeved with one end of the second sleeve, and the other end of the second sleeve is located in the second outer shell. The first distraction component and the second distraction component are respectively connected with the sliding block component in a movable mode, and the first sleeve is movably connected with the second sleeve. The vertebral body fusion device is convenient to operate and capable of playing a good supporting role in a spine, facilitates the operation of surgery, and has good stability.