The invention discloses an automatic telescoping tray. The automatic telescoping tray comprises a fixed bottom plate, a middle sliding plate and an upper tray, wherein the upper tray is in slide connection with the upper surface of the middle sliding plate; a left pulley and a right pulley are correspondingly arranged at the left end and the right end of the middle sliding plate; the lower surface of the middle sliding plate is in slide connection with the upper surface of the fixed bottom plate through slide rails; a first pulley and a second pulley are symmetrically arranged at the left end and the right end of the upper surface of the fixed bottom plate; the middle sliding plate is driven through a chain wheel structure which is arranged on the fixed bottom plate; the upper tray is driven by the middle sliding plate to telescope under the matching of steel wires and the pulleys. According to the automatic telescoping tray, the three-layer design comprising the fixed bottom plate, the middle sliding plate and the upper tray is provided, and a chain wheel, steel wire and pulley moving mechanism is arranged, so that the upper tray can be flexibly telescoped. The automatic telescoping tray is reasonable in overall design, simple and effective in the movement mechanism, low in cost, and simple to control. The automatic telescoping tray can be applied to various material picking and conveying fields, and is high in economy and practicability.