For the compact cyclotron CYCIAE-100, two proton beams are extracted in dual directions by stripping foil. For the high vacuum condition, the foil changer with a plate carrying 12 stripping foil is placed in the vacuum chamber. The movement of the foil changer is divided into four parts: the rotation of the plate, the transverse movement of the pole, and the radial movement of the pole which includes coarse movement and fine regulating. The whole system should be highly accurate and reliable, and meanwhile it is required that the design should be as simple as possible. For the compact cyclotron CYCIAE-100, two proton beams are extracted in dual directions by stripping foil. For the high vacuum condition, the foil changer with a plate carrying 12 stripping foil is placed in the vacuum chamber. The movement of the foil changer is The whole system should be highly accurate and reliable, and meanwhile it is required that the design should be as simple as possible.