With the increasing demand for improving facial and neck aging among people, the attention to emerging anti-aging technologies has gradually risen. Focused ultrasound is a novel non-invasive treatment technology. It precisely delivers energy and generates thermal energy within the dermis and subcutaneous tissue, prompting immediate denaturation and contraction of collagen, thereby achieving effective suspension and lifting of the fascia layer. Meanwhile, this technology can also stimulate the body to produce new collagen and elastin, which can improve facial and neck skin laxity in the long term. This paper reviews the application mechanism of focused ultrasound technology and its current application status in cosmetic dermatology, aiming to provide a reference for the application of focused ultrasound technology in cosmetic dermatology.