The invention relates to a construction method of large-volume original decorative large pier stud fair-faced concrete, which is applicable to the construction of large-area, large-bevel and irregular large-volume original decorative large pier stud fair-faced concrete. The construction method is characterized by comprising the following steps of: building large pier stud reinforcement bar support; manufacturing templates; hoisting and mounting the templates; casting concrete; automatically monitoring the temperature of the concrete by a computer through an embedded thermal sensor; dismounting the templates when concrete hydration heat falls back; hanging plastic films and five-layer plywood by adopting typed wall bolt holes for perform moisture preserving protection maintenance after the templates are dismounted; simultaneously conducting film covering heat preservation maintenance on the top part, the side surfaces and the bottom part of the concrete with plastic films and burlap bags; maintaining the dismounted templates and other fittings for use; and sanding the surface layer of the maintained fair-faced concrete with sand paper and adopting fluorocarbon coating protection.