The invention discloses an installation structure for a radial sensor of a magnetic levitation motor. A sensor bracket and a cover body are fixed on a machine base; the sensor bracket and the cover body are propped against each over and are spliced into a machine base end cover; a detection block sleeves a bearing end cover; the detection block and the bearing end cover are in interference fit; aradial detection gap is formed between an outer wall of the detection block and an inner wall of the sensor bracket; an axial detection gap is formed between the bottom surface of a rotor and the bottom surface of the inner wall of the cover body; the radial sensor is arranged on a side wall of the sensor bracket and detects the dimensional change of the radial detection gap; an axial sensor and an axial compensation sensor are arranged on the cover body; and the axial sensor detects the dimensional change of the axial detection gap. The machine base end cover of the installation structure isformed by splicing the sensor bracket and the cover body and can be disassembled, so that assembly and disassembly and maintenance of the radial sensor and the axial sensor are facilitated.