The utility model provides a mobile gantry-type engraving platform teaching demonstration device, comprising an X-direction feed system, a Y-direction feed system, an Z-direction feed system, a base, a work bench, a portal frame, and a spindle component. The base is made of a solid steel plate. The work bench is installed on the base, and is fixed by fasteners. The Y-direction feed system is installed on the base. The portal frame is installed on the Y-direction feed system. The X-direction feed system is installed on the portal frame. The Z-direction feed system is installed on the X-direction feed system. The spindle component is installed on the Z-direction feed system. The device uses a gantry moving type layout which is simple in structure and good in rigidity, and the device can satisfy processing requirements of heavy workpiece. The device is simple in structure, convenient in use, and good in demonstration effect. Students can visually see the engraving state of an engraving machine on vision, and can understand easily, and student learning interest can be preferably stimulated.