The utility model discloses a protecting sleeve for an illumination lamp handle of a dental chair. The protecting sleeve is the same as the illumination lamp handle of the dental chair in size, wrapped on the illumination lamp handle of the dental chair and formed through medical silicone rubber casting. The protecting sleeve is simple in clinical procedure and reusable, avoids resource waste and environmental pollution and lowers the cost; what is more important is that the protecting sleeve can effectively prevent the problem of cross infection arising from the lamp handle of the dental chair; therefore, the protecting sleeve is good in clinical popularization.