The invention, which belongs to the field of electromagnetic method data processing of the artificial field source frequency domain for geophysical exploration, discloses a near-field correction method of the apparent resistivity of a controlled source audio-frequency magnetotelluric method. The method comprises: step A, transforming current data, electric field data, and magnetic field data in atime domain into frequency domain data by using Fourier transformation; step B, according to electric field data and magnetic field data in the frequency domain data, carrying out calculation to obtain a Cagniard apparent resistivity and a phase; and step C, determining whether a near-field effect exists based on the Cagniard apparent resistivity and phase features; and if so, acquiring a correction parameter based on ratio of normalized theoretical electric field data to electric field data after current normalization. Therefore, morphological distortion of an apparent resistivity curve is corrected and a low-frequency data form is restored; and thus the data of the source-detectable audio-frequency magnetotelluric method can be applied to the data inversion to the great extent, so that more underground electrical structure information is obtained.