The invention relates to the technical field of deep-sea electromagnetic surveying, in particular to a deep-sea pressure bearing compartment. The deep-sea pressure bearing compartment comprises a front end cover, a pressure bearing compartment body and a rear end cover. The front end cover and the rear end cover are detachably connected to the pressure bearing compartment body, the pressure bearing compartment body is cylindrical, an installation plane which is matched with the surface of a heating component to be installed is arranged on the inner wall of the pressure bearing compartment body, and an auxiliary radiator is arranged at the position, corresponding to the installation plane, of the outer wall of the pressure bearing compartment body, and is used for heat dissipation of the high-power heating component. By the adoption of the deep-sea pressure bearing compartment, the pressure bearing performance is guaranteed, the heat dissipation performance is remarkably improved, and the deep-sea pressure bearing compartment is compact in structure, large in compartment space and good in leakproofness, easy to assemble, and applicable to installation of high-power equipment and particularly applicable to installation of high-power transmitter systems.