The invention relates to an automatic fruit-sorting device which comprises a box, a tray, a connecting rope and a plurality of counterweights; a cubic box is horizontally divided into A and B boxes; arope veering pulley block is arranged on the top of the box; a plurality of discharging channels are arranged along a vertical direction at intervals on a side wall on one side in a first box away from a second box; doors for opening or closing the discharging channels are arranged on the box corresponding to the discharging channels above the bottom discharging channel; the tray is sleeved in the first box and is capable of moving up and down in the first box; an upper end plate of the tray is arranged in the manner of inclining to one side of the discharging channels; the counterweights arearranged in the second box along the vertical direction at intervals; the counterweights are respectively equipped with rope-penetrating through holes which are penetrated through the counterweights;one end of the connecting rope is connected with the bottom counterweight; the other end of the connecting rope is upward penetrated through the rope-penetrating through holes on the counterweights in turn and is connected with the upper end of the tray in the manner of passing by the rope veering pulley block. The automatic fruit-sorting device is beneficial to relieving the workload of workers,optimizing the working environment of the workers and increasing the production efficiency.