The invention provides a cast-in-place concrete box girder combined moving formwork and relates to a concrete box girder moving formwork which is used to solve the problems that an existing simply supported beam formwork has a slow installing and dismantling speed and the concrete pouring precision is low. The moving formwork includes a formwork system, a formwork supporting system, a sliding system and a support system. The formwork system includes an outer die, a bottom die, an angle die and an inner die. The formwork supporting system includes an upper adjusting support, an outer die supporting frame, an inner die supporting rod and a jack. The sliding system includes a sliding joist, a pulley and a track. The support system includes a formwork support, a sliding support, a small distribution beam and a large distribution beam. The moving formwork is simple in structure and convenient to combine and dismantle, the formwork utilization rate can be improved, and the cast-in-place concrete box girder construction efficiency and quality are improved. The cast-in-place concrete box girder combined moving formwork is used for pouring a concrete box girder.