The invention discloses an indoor orbit-determination mobile photogrammetric system, comprising an indoor rail suspended in air; a mobile platform which can run along the rail; a photograph mechanism which is arranged on the lower part of the mobile platform and comprises a CCD camera and a camera fixing crossarm; a PC computer which is connected with the CCD camera by a data transmission circuit; bar codes which can be taken in by the CCD camera and are regularly arranged on inside walls according to a setting distance; a control device which is used for controlling the running state of equipment including the mobile platform. The measuring system contributes to the rapid, dynamic and continuous collection of silt sediments geometric data information in sediment deposition labs of projects like water project.