A side-by-side parcel separation method, comprising the following implementation steps: 1) dispersion dispersing, by means of an angle difference existing in a conveying direction, parcels arriving at a dispersion device from a conveying line, wherein a gap is reserved between adjacent parcels; 2) detection and recognition photographing and recognizing detected parcels by means of a visual recognition device so as to obtain the three-dimensional size and the real-time position data of each parcel; wherein the visual recognition device performs edge detection on parcel images according to an image recognition algorithm, and screens out 3D coordinates and position information of the parcel corresponding to edge information of the parcel; dimension coordinates of an outermost part of the parcel in a conveying direction are defined as a current position of the parcel; 3) separation applying different conveying speeds to the recognized adjacent parcels by means of a separation device, arriving, by a first parcel that is recognized to be at a front position, at a side-approaching device at a fast speed, and repeating the foregoing steps; and 4) single-row queuing forwardly conveying, in a single-row queuing mode, different parcels that arrive at the side-approaching device in sequence. 1) dispersion dispersing, by means of an angle difference existing in a conveying direction, parcels arriving at a dispersion device from a conveying line, wherein a gap is reserved between adjacent parcels; 2) detection and recognition photographing and recognizing detected parcels by means of a visual recognition device so as to obtain the three-dimensional size and the real-time position data of each parcel; wherein the visual recognition device performs edge detection on parcel images according to an image recognition algorithm, and screens out 3D coordinates and position information of the parcel corresponding to edge information of the parcel; dimension coordinates of an outermost part of the parcel in a conveying direction are defined as a current position of the parcel; photographing and recognizing detected parcels by means of a visual recognition device so as to obtain the three-dimensional size and the real-time position data of each parcel; wherein the visual recognition device performs edge detection on parcel images according to an image recognition algorithm, and screens out 3D coordinates and position information of the parcel corresponding to edge information of the parcel; dimension coordinates of an outermost part of the parcel in a conveying direction are defined as a current position of the parcel; 3) separation applying different conveying speeds to the recognized adjacent parcels by means of a separation device, arriving, by a first parcel that is recognized to be at a front position, at a side-approaching device at a fast speed, and repeating the foregoing steps; and applying different conveying speeds to the recognized adjacent parcels by means of a separation device, arriving, by a first parcel that is recognized to be at a front position, at a side-approaching device at a fast speed, and repeating the foregoing steps; and 4) single-row queuing forwardly conveying, in a single-row queuing mode, different parcels that arrive at the side-approaching device in sequence.