A multi-cycle shipment sorting system, comprising a delivery platform, provided with a delivery entrance, a delivery outlet, and an unloading port; a delivery device, capable of delivering a plurality of shipment boxes in sequence from the delivery entrance to the unloading port, and outputting, after unloading, a plurality of the shipment boxes from the delivery outlet, wherein more than one piece of a same kind of shipment is contained in each of the shipment boxes, different shipment boxes are capable of containing same or different shipments, and each of the shipment boxes is installed with an identification device; characterized by comprising: a sorting platform, provided with a sorting entrance, a sorting outlet, and a cyclic section, wherein the cyclic section is provided with a loading port; plural self-navigation trolleys, wherein the self-navigation trolleys enter from the sorting entrance, and are ranked, when passing through the cyclic section, according to positions of shipments delivered by the delivery device, then run out of the sorting outlet after loading at the loading port; a positioning device, configured for performing positioning when the self-navigation trolleys are running; a shipment-carrying device, provided with an identifier that can read the identification devices of the shipment boxes, wherein the identifier is fixed close to the unloading port, and the shipments in the shipment boxes can be taken out and loaded on the self-navigation trolleys located at the loading port manually or by a robot; a server, wherein the server is connected to the self-navigation trolleys in a wireless manner, and is connected to the identifier, the delivery device, and the robot in a wired or wireless manner, respectively; and wherein the shipment-carrying device further comprises a displayer and/or a sound player, wherein the displayer and/or the sound player is electrically connected to the server, and workers load the shipments manually according to prompts of the displayer and/or the sound player. a delivery platform, provided with a delivery entrance, a delivery outlet, and an unloading port; a delivery device, capable of delivering a plurality of shipment boxes in sequence from the delivery entrance to the unloading port, and outputting, after unloading, a plurality of the shipment boxes from the delivery outlet, wherein more than one piece of a same kind of shipment is contained in each of the shipment boxes, different shipment boxes are capable of containing same or different shipments, and each of the shipment boxes is installed with an identification device; a sorting platform, provided with a sorting entrance, a sorting outlet, and a cyclic section, wherein the cyclic section is provided with a loading port; plural self-navigation trolleys, wherein the self-navigation trolleys enter from the sorting entrance, and are ranked, when passing through the cyclic section, according to positions of shipments delivered by the delivery device, then run out of the sorting outlet after loading at the loading port; a positioning device, configured for performing positioning when the self-navigation trolleys are running; a shipment-carrying device, provided with an identifier that can read the identification devices of the shipment boxes, wherein the identifier is fixed close to the unloading port, and the shipments in the shipment boxes can be taken out and loaded on the self-navigation trolleys located at the loading port manually or by a robot; a server, wherein the server is connected to the self-navigation trolleys in a wireless manner, and is connected to the identifier, the delivery device, and the robot in a wired or wireless manner, respectively; and wherein the shipment-carrying device further comprises a displayer and/or a sound player, wherein the displayer and/or the sound player is electrically connected to the server, and workers load the shipments manually according to prompts of the displayer and/or the sound player.