Severe periodontitis is a common oral disease in clinic. With the continuous development and maturity of full-mouth immediate implant technology, this technology has become an important intervention for the treatment of severe periodontitis, which can effectively improve the patient's tooth loss and oral function, and has high repair efficiency and good effect. This article mainly discusses the application progress of full-mouth immediate implant in patients with severe periodontitis, analyzes the impact of severe periodontitis, the advantages of full-mouth immediate implant technology and its clinical application effect, digital application challenges and future development trends, in order to provide some help for relevant workers.