The invention relates to side-push type box body encasement equipment. The side-push type box body encasement equipment comprises a box body feeding device, and a box body casing device and a box arranging and pushing device are fixedly connected to the two sides of the box body feeding device separately; the box arranging and pushing device comprises a protecting cover, and an air cylinder, a fixing base, a supporting base, a connecting plate, a box arranging part and a box pushing part are arranged in the protecting cover, wherein the box arranging part and the box pushing part are used for pushing plates; the box body casing device comprises a case expanding support, wherein one side of the case expanding support is fixedly connected to the box body feeding device, and the other side of the case expanding support is provided with a case opening expanding part; a box body stacking part is arranged below a cross beam of the case expanding support; the case opening expanding part comprises a left-right case expanding assembly capable of adjusting the width transversely and an up-down case expanding assembly capable of adjusting the height longitudinally; the box body stacking part comprises an upper air cylinder connecting plate and a lower air cylinder connecting plate, and three stacking air cylinders connected in an end-to-end mode are arranged between the two air cylinder connecting plates longitudinally; a box stacking plate is arranged above the upper air cylinder connecting plate; the air cylinder connecting plates, the stacking air cylinders and the box stacking plate are integrated; and a floating joint is arranged at the bottom.