The invention discloses an intelligent construction method for a suspension part for a crash barrier for an expressway. The intelligent construction method comprises the steps of analyzing informationof the expressway by combining a high-definition map and an analysis module to obtain construction information of the crash barrier; after materials are prepared according to the construction information, nailing anchor rods at all installation points on the expressway according to an implementation instruction of a positioning module; installing left side plates of the crash barrier on the anchor rods; using steel bars for connecting every two adjacent anchor rods; arranging transverse support steel bars on the two sides of the anchor rods; inserting bottom plates on right side plates of thecrash barrier, and installing the right side plates on the left side plates; arranging oblique support steel bars between the bottom plates and the transverse support steel bars; and filling the positions between the left side plates and the right side plates with rubber melting liquid, and installing top plates. The map and software analysis are combined to achieve accurate implementation of thecrash barrier, and the construction quality and the protection effect are effectively improved; and the crash barrier is simple in structure and convenient to construct; meanwhile, the structure is firm; and impact damage of accidents to vehicles and passengers is reduced.