The invention relates to a method for determining the height of a fracturing facture in an offshore low-hole-seepage reservoir. Under the condition of determining that no fleeing layer exists in cementing by virtue of comparing cementing quality and logging information before and after fracturing, and rapid and slow transverse wave separation treatment is performed on crossed diploe transverse wave logging information, the before-fracturing and after-fracturing transverse wave fracturing degrees are calculated; the after-fracturing transverse wave fracturing value of the same well section is compared with a background value by virtue of taking the before-fracturing transverse wave fracturing degree as the background value, wherein the length of the cementing section with the after-fracturing transverse fracturing value greater than the background value is the height of the fracture. The method is visual and accurate, and can be applied to low-hole-seepage reservoir fracturing effect evaluation and regional comprehensive research, and can be used for greatly improving the success rate of evaluation on the fractured offshore low-hole-seepage reservoir and providing an important technical support for efficient exploratory development of the offshore low-hole-seepage reservoir.