The invention relates to a method for quantifying body function of old people on the basis of PageRank, and belongs to the technical field of biomedicine. The method comprises the following steps of: firstly representing relevance between attributes by utilizing a covariance matrix; taking the relevance as input of a PageRank algorithm to obtain weight of each dimension of attribute of the body function; obtaining body function scores of old people through a linear weighting method; feeding back the body function scores in a centesimal system form; and finally validating the reasonability of the body function scores from the aspects of gender, age, culture, place of residence, monthly income and degree of education by utilizing a univariate analysis method. Results indicate that the method is capable of effectively carrying out quantification on the old people, so as to provide basis for improving the body function of the old people.