The digital image fuzzy filtering operation is always used to beautify the forged image. In this paper, we propose a blind forensics algorithm which can detect the average filter, Gaussian low-pass filter and median filter. Firstly, the high frequency residual is used as the feature extraction domain, and then the feature extraction is carried out based on the local binary pattern (LBP) and the autoregressive model. Finally, A fuzzy filtering detector is set up by using the support vector machine. The experimental results show that the proposed method can detect the fuzzy filtering operation effectively and has good robustness against JPEG compression.