Insulating ceramic component and electric vacuum device

The utility model discloses an insulating ceramic component, which relates to the field of insulating ceramics, is used for an electric vacuum device, and comprises an insulating ceramic body and a voltage-resistant coating, the surface of the insulating ceramic body comprises a voltage-withstanding surface and a combination surface used for being in contact with an electrode, and the voltage-withstanding surface is provided with a step-shaped structure and is connected with the combination surface through the step-shaped structure; and the pressure-resistant coatings are distributed on each surface of the step-shaped structure. According to the insulating ceramic component, the area, combined with the combination face, of the pressure-resistant face of the insulating ceramic body is of the step-shaped structure, the step-shaped structure has an uneven surface, and in other words, the area, combined with the combination face, of the pressure-resistant face is of the uneven structure; and the step-shaped struc