The utility model relates to an ellipsograph which belongs to the technical field of a teaching appliance. The utility model is characterized in that a rotary disc is fixed on an operating shaft, and the edge of the rotary disc is fixed with a positioning threaded rod. A positioning sliding block of the rotary disc is sheathed at an extension ruler arm, and can be slid on the extension ruler arm. The sliding block is connected with the top end of a sleeve barrel, and is hinged and fixed with one end of the extension ruler arm. The sliding block is connected with the sleeve barrel, and can be slid on cross guide passages through a guide passage sliding block. The four guide passages are respectively fixed on a bearing box of the guide passage, and the rotary disc and a support tripod are respectively fixed on the base through bearings. The operating shaft and the extension ruler arm are connected through a vaginal orifice, and an output compasses arm is fixed at the outer end of the extension ruler arm. The utility model has the advantages that the ellipsograph can be used for teaching demonstration, and can also be used for practical drawing, and the use is convenient and fast.