The invention provides an optimized construction method of a pile-supported embankment BIM technology, wherein the method comprises the following steps: 1, importing two-dimensional CAD drawings intoBIM modeling software to establish a three-dimensional pile-supported embankment structure model; 2, simulating the pile-supported embankment through the BIM modeling software; 3, carrying out pile-supported embankment stress analysis by BIM calculation software; 4, carrying out pile-supported embankment construction cost analysis by BIM amount calculation software; 5, optimizing a pile-supportedembankment structure system through the step 3 and the step 4, to achieve the purposes of reasonable stress, safety, reliability and economical construction cost; 6, carrying out scheme clarificationfor construction personnel by BIM model pictures and animation; 7, constructing at a construction site according to the optimized pile-supported embankment construction scheme; and 8, inputting construction data into a BIM5D cloud platform for data electronic filing. The problems of low security or high construction cost of the whole system caused because a traditional construction method cannot modify the whole system according to defect information are solved.