The invention relates to a construction method of a large steel concrete composite multi-terrace slope skewback. The construction method comprises the steps of manufacturing and hoisting a steel skewback in segments; using a supporting bracket for temporary support; and accurately adjusting the position of the skewback by using a three-way jack to assemble and weld the skewback into a whole. The concrete skewback adopts a construction method using a large closed steel mould and pouring and forming self-compaction shrinkage-free concrete by one step. The invention has definite directive significance for the construction of a large complex steel concrete composite skewback structure, and provides a construction method of a steel concrete composite multi-terrace slope skewback for the designand the construction for building a railway and a highway arch bridge with a span of 500m on rivers in flat areas. The construction method has the advantages of safe construction and good quality, and is free from the limitations of the topographic condition of the skewback.