A double-velocity energy-saving generating system arrangement for container rubber-tired gantry crane, engine-driven system of oil engine cooling port of the container rubber-tired gantry crane is connected and drives a low power auxiliary generator which supplies power for air conditioning, intercom, illumination and micro processor of the GPS positioning system of the container rubber-tired gantry crane. Application of the arrangement is capable of being avoid rotary speed and low efficiency operation in idling condition of the main oil engine generator set to largely save oil and decrease cost of operation while constant price rise, and also reducing the operating time of the main generator to prolong the lifetime of the main generator and improve reliability of hoisting control and auxiliary system.