The utility model relates to an immersed tube inner portion rectifying and adjusting system. The immersed tube inner portion rectifying and adjusting system comprises a control system and a mechanical system. The mechanical system comprises a hydraulic power pack, a jack group and a jack ejecting rod group. The jack group is arranged at the front end of an immersed tube to be installed through a crack. The jack ejecting rod group is arranged at the tail end of the immersed tube to be installed and the tail end of an installed immersed tube through a flange. The jack group is a group of jacks formed by a plurality of jacks capable of limiting and jacking, wherein the plurality of jacks capable of limiting and jacking are connected together through a fixing rack. The jack ejecting rod group is a group of jack ejecting rods formed by a plurality of jack ejecting rods, wherein the plurality of jack ejecting rods are connected together. The immersed tube inner portion rectifying and adjusting system is simple and reasonable in structure, convenient to operate, capable of being placed into a combining cavity between the immersed tube and the immersed tube to be installed to rectifying the inner portion of the immersed tube when the immersed tube is installed, having no requirement for a gravel bed, and being hardly influenced by natural conditions like waves, currents, winds and the like during adjusting process, accurate in positioning and installing, time-saving and labour-saving.