The invention belongs to the technical fields of body surface projection adjustment and motion capture, and in particular relates to an axis adjustment member for a body surface projection adjustment device for minimally invasive surgery, comprising: an axis drive member, a first waist bar, a first fixing member, a second The waist strip, the swing table and the second fixing part, the shaft driving part are arranged on the thigh pad, the first waist strip and the second waist strip are sleeved with sliding sleeves, and the side of the first waist strip is provided with The first fixing part, the swing table is hinged on the foot pad, the swing table sensor is arranged on the swing table, and the second fixing part is arranged on the foot pad; the swing table is straightened by the second fixing part, as a starting point Position, due to the movement of the calf relative to the foot pad, the swing table swings, from which it can be judged whether the virtual axis is coaxial with the hinge axis, and based on this, adjust the position of the hinge axis to be coaxial with the virtual axis, so that the calf swings the input When coordinate information, the calf and the calf pad can be synchronized to ensure the accuracy of the input information.