Disclosed is a parcel sorting system, it includes a main frame and a sorting tower; the main frame includes a vertically arranged spiral slide and a supporting plate horizontally arranged outside the spiral slide, and the lower end of the spiral slide is provided with a collection bag main outlet. The supporting plate is provided with a collection bag falling port facing the spiral slide; the sorting tower includes a receiving transfer device, a plurality of bagging output devices disposed below the receiving transfer device, and a tower housing disposed below the bagging output device; A plurality of sorting towers are arranged on the supporting plate around the spiral slides, and the collection bag discharge ports of each sorting tower are respectively connected to the falling ports of the collection bags of the supporting plates. The invention which greatly improves sorting efficiency compared to single-pass sorting of existing sorting systems.