A horizontal motion track recorder of a rubber support relates to the engineering anti-seismic field and comprises a recording plate and a recording pen, wherein the recording plate is firmly installed on an upper embedded plate of the rubber support; the recording pen is firmly installed on a lower embedded plate of the rubber support; and a pen tip of the recording pen is in elastic contact with the recording plate by a pressure spring. When fortification seismic motion takes place, the recording plate can be detached; horizontal relative motion tracks can be recorded in writing through facsimile; a maximum value scope of the motion tracks recoded in writing is measured and analyzed; seismic fortification theoretical requirements of the seismic isolation rubber support can be verified; and sufficient instance data can be provided for seismic isolation design improvements. A recording instruction can be installed in addition, wherein the recording instrument is connected to the recording plate so as to record tracks of the pen tip on the recording plate. The device can effectively record a changing scope of the horizontal relative motion tracks of the rubber support and is of important scientific research significance for researching horizontal shear characteristics of the rubber support under the fortification seismic motion.