Navigation screen fixing back clamp

The invention discloses a navigation screen fixing back splint, and belongs to the technical field of navigation screens. A navigation screen fixing back splint comprises a box body, and an external loudspeaker is fixedly arranged in the box body; the mounting frame is fixedly arranged at the top of the box body, a navigation screen is fixedly arranged on the inner side of the mounting frame, and a back plate is fixedly arranged on the back of the mounting frame; the rotating assembly is arranged between the supporting plate and the box body, the box body and the mounting frame are driven by the rotating assembly to rotate at the top of the supporting plate so that the angle of the navigation screen in the mounting frame can be adjusted, the use comfort can be improved, the external loudspeaker is arranged in the box body and used for voice playing of the navigation screen, and when the navigation screen is not used, the external loudspeaker can be used for voice playing of the navigation screen. The box body