The invention discloses a compound shaft sleeve structure of a magnetic suspension motor rotor. The compound shaft sleeve structure comprises a transition sleeve body, a magnetism isolating ring and adetection ring. The magnetism isolating ring and the detection ring are separately arranged on two sides of the transition sleeve body and are in interference fit to the transition sleeve body; the detection ring is arranged on the transition sleeve body in a sleeving mode, and the outer wall surface of the detection ring is aligned to the outer wall surface of the transition sleeve body; one endof the magnetism isolating ring penetrates the transition sleeve body and the outer wall surface of the magnetism isolating ring is aligned to the outer wall surface of the transition sleeve body; the transition sleeve body is made from high alloy steel, the magnetism isolating ring is made from austenitic stainless steel, and the detection ring is made from a nickel-based alloy. By utilizing thecharacteristics of different materials reasonably, the materials draw on each other's strength through a structural design, so that the integral optimum performance is achieved. The compound shaft sleeve structure is low in cost of parts and easy to produce, and the output is improved.