The invention provides a complex formation clay content measuring method based on electric imaging logging information. The method comprises the following steps: logging of block key well information and core data acquisition; respectively carrying out ground gamma measurement and X diffraction analysis on the core, and determining gamma value and clay content of core; realizing depth location of core through comparison between the ground gamma value and a logging gamma value; reading the electric imaging logging information corresponding to actual core depth and carrying out image preprocessing; executing histogram statistic on the preprocessed electric imaging logging data, thus obtaining resistivity distribution; obtaining resistivity distribution range limit of mud rock through a conjugate gradient optimization technology, thereby counting clay volume content; and further correcting the volume content into a mass friction in combination with the experimental clay content, and thus obtaining a reliable clay content. The method can effectively achieve measurement of clay content of complex formation (complex lithology, thin interbed and development thereof), and has important significance to research on hydrocarbon reservoir saturation model, additional conductivity, and so on.