The invention discloses an automatic tray unloader suitable for small-volume bottles. The automatic tray unloader comprises a rack, wherein a bottle carrying mechanism, a bottle pushing mechanism and a tray unloading station support are installed on the rack; a lifting mechanism is connected below the tray unloading station support; a stop dog is arranged on the rack above the tray unloading station support; the bottle carrying mechanism comprises a bottle carrying power mechanism, a bottle carrying sliding rail and a bottle carrying plate which is connected with the bottle carrying power mechanism; the bottle carrying power mechanism is installed on a bottle carrying connection plate; the bottle pushing mechanism comprises a bottle pushing power mechanism, a bottle pushing sliding rail, a push rod and a switch plate; and the push rod is connected with the bottle pushing sliding rail through a sliding block. The automatic tray unloader is reasonable in structural design, high in integration degree, safe and convenient to use and good in operation stability, and is capable of realizing the online automatic tray unloading of oral liquid bottles and enabling the tray unloading efficiency to be up to 50 trays in each hour, so as to save the labor, decrease the quantity of operators in the tray unloading area and change the heavy manual operation into automatic operation.