The invention discloses a quantitative method for an area percent of a martensite-austenite (MA) island structure, and belongs to the technical field of metallographic structure quantifying, in particular to a method for performing quantitative analysis on the area percent of the MA island structure contained in a steel material. The method comprises the following steps of: preparing and coloringa sample; adjusting an image to be clear in an imaging area, and setting a contrast ratio of the MA island and other matrix structures; acquiring a picture and performing quantitative analysis on thepicture; and taking an average value of more than three results as an area percentile of the MA island of a metal material. The invention has the advantages that: by the method, a percentage content of the MA island in the steel material structure can be rapidly and precisely analyzed, and the method has important meaning for the research of the performance of some product structures.