The invention belongs to the field of metal material processing, and relates to a track plate preparation method, in particular to a method for preparing a forging piece of an aluminum-steel composite structure track plate. The method includes the steps that an ingot casting is prepared by means of semi-continuous casting at first; then the aluminum alloy ingot casting is prepared into an extrusion material by the adoption of forward or backward extrusion; the extrusion material is blanked according to the dimension, and an aluminum alloy track plate pre-forging piece is pre-forged through constant temperature die forging; and afterwards, a cast steel block and a pre-forged aluminum alloy track plate are forged into a whole by means of finish forging, so that the aluminum-steel composite structure is formed. The weight of the aluminum-steel composite structure track plate prepared through the method is lowered by 30% compared with a steel track plate; and meanwhile the abrasion resistance and overall strength of the track plate can be guaranteed, and the structural performance is reliable.