The invention relates to an insulated sleeve of an optical communication sub-module. The insulated sleeve comprises a body and a first clamping part, wherein the body is sleeved on an outer sleeve part of the optical communication module, and the first clamping part is formed on the outer surface of the body and clamped with a second clamping part of an accommodation chamber of an optical transceiver shell so that the optical communication sub-module is clamped in the accommodation chamber. The invention simultaneously discloses an optical communication sub-module comprising the insulated sleeve as well as an optical transceiver.