The invention discloses a split power turbine structure with pressure self compensation, and relates to the technical field of split power turbine structures. The structure comprises a heat insulationassembly which is arranged between a turbine housing and an intermediate housing to perform pressure balancing on lubricant by using tailing gas generated by a turbine. The structure has the advantages that the problems of more components related in the turbine structure, complicated installing, the failure of effectively preventing the seepage of the lubricant by flowing air, the failure of using other casting molds, the need of newly producing a whole set of molds, poor product universality, and the need to adjust the designing and pressure of a pipeline component when connecting pressurized air of a compressor in the prior art are solved.