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High-temperature superconducting (HTS) cable terminal is an important part of the HTS cable system, which functions to improve the internal electric field distribution and the electrical insulation strength of the cable termination. In this paper, the particle swarm optimization method is adopted to the 35-kV HTS cable terminal stress cone. The capacitance, radial electric field, axial electric field, voltage, and other parameters of the stress cone were compared before and after the optimization of the stress cone. The simulations of the stress cone with the optimized structure were made using finite-element analysis software ANSYS. Finally, a capacitor voltage test verifies the equal capacitance and gradient design of stress cone.