Black mustard seed oil was obtained from the seeds of mustard seed in Cruciferae by steam distillation, and white mustard seed oil was obtained from the seeds of white mustard seed by solvent extraction. Mustard oil can be divided into black mustard oil and white mustard oil.

Mustard oil is a kind of seasoning oil, commonly known as mustard oil or mustard seasoning oil. It is made by distilling mustard essence from yellow mustard seed and diluting the oil squeezed from the remaining mustard cake in proportion.