The invention discloses a full-automatic side brushing and box dividing and pressing machine. The full-automatic side brushing and box dividing and pressing machine comprises a box dividing mechanism, a side brushing mechanism is arranged on the box dividing mechanism, and the front side and the rear side of the side brushing mechanism are provided with box pressing mechanisms. The side brushing mechanism can carry out side brushing treatment on paper boxes in a full-automatic manner, the box dividing mechanism can carry out distributing on the paper boxes obtained after side brushing towards the left and right sides or the front and back sides in a full-automatic manner, and the box pressing mechanisms can carry out pressing treatment on the paper boxes conveyed after being distributed in a full-automatic manner; due to the fact that the multiple box pressing mechanisms are arranged, and can independently carry out pressing on the paper boxes in an asynchronization manner, the time when the paper boxes wait for entering in the box pressing working procedure after side brushing treatment is shortened, the problem that due to the fact that waiting time needed by allowing the paper boxes to be subject to two working procedures of folding in and box pressing is long, the assembly paper boxes are long in production period, low in efficiency, high in cost and the like is avoided, and compared with an existing paper box forming machine, the full-automatic side brushing and box dividing and pressing machine has the beneficial effects that the work efficiency is improved by more than 50%, and the capacity is improved by more than 50%.