The invention discloses a center shield device and a steel rail printer. According to the center shield device and the steel rail printer, concentricity of connection between a sliding ring device and a star-shaped disc driving motor can be guaranteed, and a dynamic electric circuit can not be pulled apart easily. The center shield device comprises a first flange and a second flange, wherein a connecting device is arranged between the first flange and the second flange, and an inner positioning sleeve is arranged in the second flange. The center shield device further comprises a inner penetrating hole which penetrates through the first flange, the connecting device and the second flange in sequence, wherein the inner penetrating hole is communicated with the inner positioning sleeve and is coaxial with the inner positioning sleeve, an outlet hole communicated with the inner penetrating hole is formed in the pipe wall of the connecting device, a plurality of bolt holes are formed in the first flange, and a plurality of bolt holes are formed in the second flange.