The invention provides an aseismic dynamic background field based extraction method of seismic TEC abnormal information. The method comprises the following steps of establishing a dynamic background field, carrying out wavelet multi-scale analysis, utilizing a support vector machine regression model and carrying out a method for extracting abnormal information. According to the extraction method,through an aseismic dynamic background field, the own periodical change of a TEC is considered; meanwhile, the interference of space environments of a solar activity and a geomagnetic activity and thelike are also considered; an extractable seismic TEC abnormality is more accurate; meanwhile, the interference and error brought by other aseismic factor in the process of extracting seismic ionospheric TEC abnormal information can be reduced; the detection accurate rate of the seismic TEC abnormality is improved; the method has a higher early warning rate during a seismic period and a lower false warning rate during an aseismic period; and the extraction efficiency of the seismic TEC abnormal information can be improved.