Formwork supporting system suitable for steel-concrete composite bridge and prediction method

The invention relates to a formwork supporting system suitable for a steel-concrete composite bridge, which comprises a box chamber, and further comprises a formwork support which is of a telescopic structure and is provided with connecting assemblies at the two ends; and the box chamber is connected by adjusting the length of the template support. At least one row of formwork supports are fixedly installed between every two adjacent box chambers of the supporting system, and formworks between the two box chambers or formworks of cantilevers on the two sides of a combined bridge and formworks in the box chambers can be supported; when the number of the rows is larger than two, every two adjacent rows of formwork supports are fixedly connected together through the corresponding supporting rods, the multiple connecting assemblies are fixedly installed at the two ends of each formwork support, the formwork supports and the box chamber are connected into a whole, and the bearing capacity of the formwork supports