In order to achieve the road surface flatness measurement, the magnetic levitation technology was used to measure the vibration of the car during driving to achieve road surface flatness measurement. A magnetic levitation measurement model of double magnetic suspension oscillator was designed. The force relationship of the magnetic levitation oscillator was obtained by experimental data, and the equation of motion of the magnetic levitation oscillator was established. A simulation model of the magnetic levitation measurement system was established. A flat roads, narrow speed bumps, wide speed bumps, urban roads and longdistance travel measurements were measured using the designed measurement model. The wavelet analysis method is used to perform 5 layers of wavelet decomposition on the measured vibration signals to obtain approximating signals and detail signals and wavelet reconstruction of the measured waveform. Road features were obtained in five different situations. This method provides a new idea for the road flatness detection method.