The invention relates to a radar refinement ranging method, and belongs to the technical field of radar signal processing. The ranging signal processing flow of the method comprises the following steps: radio frequency sampling, mixing and filtering, low-sampling frequency re-sampling, speed measurement and distance compensation, pulse pressure and interpolation, filtering and distance compensation. Under the premise of not improving the waveform design difficulty and higher hardware design requirements, the data transmission rate is high, the distance measurement accuracy is improved, the radar working performance is improved, and the radar production cost is reduced. The method solves the problems that the existing ranging mode is only used for sampling once, resulting in large samplingdata amount, increased waveform design difficulty when the signal bandwidth is increased, increased data amount, and difficult requirement meeting of the data transmission rate, and that the signal processing is rough, and if requiring increased signal bandwidth, improved data transmission rate and ranging accuracy, higher standard waveform design and hardware design support are requested, and higher requirements for corresponding sampling and data processing chips are also requested, resulting in difficulty in design and fabrication, and increased equipment cost.