The utility mode discloses a movable combined-type internal-combustion-engine comprehensive loading test system which includes a control device, a loading device and an energy dissipation device, which are assembled separately and independently. The loading device is connected with the control device and the energy dissipation device. The module combination method of the movable combined-type internal-combustion-engine comprehensive loading test system enables transportation to be convenient so that rapid and convenient operations can be carried out in a limited space of an ocean platform and thus loading test demands of internal combustion engines of a plurality of kinds and a plurality of internal combustion engines can be met effectively.