A horizontal motorized dynamic system for pallet-carrier racks, which allows the formation of a motorized dynamic system as a specific, stand-alone electromechanical structure based on a horizontal conveyor track with motorized pulleys or motorized conveyor rollers controlled by electronic boards for each pallet position. The system is intended for dynamic pallet level racking on selective pallet-carrier racks in order to provide, in an extremely practical, safe and economical manner, complete optimization and excellent performance in the manufacturing, assembly and operating procedures of pallet-carrier racks. This is combined with extraordinary structural performance and high level economy of materials and space, and is based on a motorized dynamic system of high strength, safety and versatility.