The invention discloses a method for analyzing content of dibutyl phthalate in a mixed material through a near infrared spectrum. The method comprises the following steps: preparing and collecting a batch of samples of which the content of dibutyl phthalate is in a certain range; repeatedly collecting the spectrum of each sample for at least one time, performing sample spectrum statistic analysis and principal component analysis, and removing an abnormal spectrum; performing spectrum analysis, and selecting a spectral band for modeling; dividing multiple samples into a modeling set and an inspection set; establishing various models by combining the spectral band with a preprocessing method, and selecting optimal modeling parameters and determining the optimal model according to root-mean-square prediction errors (RMSEP), RMSEP/dimension curves and principal component (PC) analysis of the spectrum; expanding sample spectrums in a corresponding concentration range and adding the sample spectrums into the modeling set when the concentration range needing to be detected changes, and modifying the detection limit of the method; and acquiring a near infrared spectrum of a to-be-detected sample, and directly detecting the sample concentration through the model. Any solvent is not used, any standard substance does not need to be prepared, and the method has the advantages of short period, environment friendliness and the like.