The invention discloses a method for determining total ferrum content in chromite, solving the problems that the traditional process for determining total ferrum content in chromite is complicated to operate, the requirement on operational personnel is high, the equipment investment is more and the accuracy is low. The method comprises the following steps of: fully decomposing a sample, carrying out sub-step titration by utilizing an automatic potentiometric titrator after the decomposed sample is reduced, calculating the difference between reading values of two equivalent points, namely the volume of a potassium dichromate standard solution consumed by total ferrum in a reagent, and then calculating by adopting a formula to obtain mass fraction (%) of the total ferrum. The method disclosed by the invention has the advantages of simpleness, rapidness, high accuracy and low equipment investment, and can be used for accurately determining chromites with different ferric contents.