The invention relates to a method of deep enzymatic degumming, in particular to a method of crude oil degumming. The method comprises the step of adding hydratable phospholipids to crude oil during a degumming process. According to the method of deep enzymatic degumming, the phosphorus content of the crude oil which is difficult to degum in pre-treatment can be decreased to 15 ppm or below, and preperably decreased to 10 ppm or below, and the demands for subsequent direct physical refining are met.