This invention relates to a non-linear correction method of linear frequency-modulated radar object meter, which belongs to signal process and automatic measurement technique field. It divides the frequency-scanning voltage curve of the control oscillator and uses frequency spectrum analysis to extract characteristics information and adopts principle of evolution computation to get the end point coordinates of the curve to form non-linear frequency-scanning curve to compensate the non-linear property of the control oscillator without measurement of high-frequency microwave signals or phase to generate the linear frequency-modulated signals with high linear property. It solves the problem of linear frequency-modulated radar non-linear property.