Abstract: Provided is an anchor assembly having a pre-stressed mandrel, which consists of an inner pre-stressed concrete mandrel and an outer cast-in-place anchoring slurry, wherein pre-stressed tendons are arranged inside the concrete mandrel and are prefabricated by a pretensioning method; the anchoring slurry wraps the pre-stressed concrete mandrel, and the cast-in-place anchoring slurry is formed by placing the pre-stressed concrete mandrel in a pile hole, and solidifying after primary grouting or secondary grouting. According to the anchor assembly, the pre-stress is not required to be tensioned and locked on site, so that the quality of the pre-stressed mandrel can be ensured, the on-site construction period can be greatly shortened, and the existing pre-stressed and common non-pre-stressed anchors can be replaced.