The invention relates to an integral fan-shaped cross-span transverse shifting method for main beams of movable formworks. The integral fan-shaped cross-span transverse shifting method includes utilizing original assembling sites, appropriately widening the assembling sites and carrying out fan-shaped cross-span transverse shifting on the main beams of the movable formworks by the aid of hydraulic flat cars. The integral fan-shaped cross-span transverse shifting method has the advantages that the cost of construction machinery can be saved, the construction progress can be accelerated, and the construction efficiency can be greatly improved; the main beams of the movable formworks can be prevented from being secondarily assembled, disassembled and pre-compressed, the mechanical equipment and personnel investment can be reduced, the construction cost can be saved, and the construction progress can be accelerated.