The present invention relates to an inertial electrostatic confinement fusion apparatus having an internal ion source, comprising an anode, a cathode, a high-voltage lead-in support rod connected to the cathode, an internal ion source, a vacuum system, and a high-voltage system, the anode potential of the internal ion source being lower than the anode potential of the inertial electrostatic confinement fusion apparatus, the cathode being a net spherical structure having spherical longitude and latitude circles, cooling channels being provided in the longitude and latitude circles, and an ion motion trajectory perturbation device being provided in the inertial electrostatic confinement fusion apparatus, and being used for performing perturbation to change the angular momentum of the ion motion. In the present invention, an internal ion source technique is used to confine the reciprocating motion of ions in the apparatus for a long time, the ion motion trajectory perturbation device is used to avoid ion loss caused by returning ions to an ion source, and a high vacuum environment is used to avoid an ion loss and a high-voltage power-source loss caused by ionization. As the accumulated ions can be injected into said apparatus for a long time, the neutron yield and the gain-loss ratio can be improved.
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