The invention discloses a box body fixing force-supporting device, in particular to a device for fixing positions between boxes in the box body placement or transportation process. The device comprises support components arranged on two sides and a connection rod between two support components, wherein one end of the connection rod is rotationally connected with one support component, the other end is connected with the other support component through a mechanism capable of adjusting length, and a location mechanism is arranged on the support components. When the device is in use, the location mechanism can be used to longitudinally or vertically locate the box body, the traverse portion can lead the support components and the connection rod to determine the distance between box bodies ontwo sides through adjusting the distance between two support components, thereby crosswise locating the box bodies. The location of all box bodies can be achieved, which guarantees the safety of transportation.