The invention discloses a lens MTF distortion correction method, and relates to the field of lens correction, and the method comprises five steps: firstly following a test point on an image, calculating a distortion correction parameter, then obtaining a distortion correction image, extracting AOI (Area of interest), calculating LSF (Line spread function), carrying out fast Fourier transform, and obtaining an MTF curve. The invention also discloses a lens MTF distortion correction device, which comprises a to-be-tested lens, the to-be-tested lens is a semitransparent chromium layer, one side of the to-be-tested lens is coated with a soda glass coating, the middle part of the to-be-tested lens is provided with a cross slit, and the cross slit is provided with a plurality of linearly distributed test patterns. According to the invention, dynamic distortion compensation correction can be carried out on each specific lens in the lens MTF measurement process, so that the measurement precision can be improved.