Sorting system and sorting method

The embodiment of the invention provides a sorting system and a sorting method. The sorting system comprises a sorting mechanism, a goods shelf, a carrying robot and a material box connection conveying line. The goods shelves are arranged in two rows and comprise a plurality of storage layers arranged at intervals in the vertical direction. Each storage layer comprises a plurality of material box grid openings, and each material box grid opening is used for storing a material box to be loaded; the sorting mechanism is arranged between the two rows of goods shelves and is configured to receive goods to be sorted and convey the goods to be sorted into material boxes of the goods shelves; the material box connection conveying line is arranged adjacent to the goods shelf and is configured to convey empty material boxes towards the goods shelf or convey full material boxes in the direction away from the goods shelf. And the carrying robot is configured to pick and place full material boxes or empty material boxes