To provide a method for producing liquid oils and fats for animal feeding stuff that exhibit high effects of removal of toxic substances, such as dioxins, and other impurities and foreign substances using simple processes, regardless of the quality of raw oil, and which are high in quality and safety, and to provide mixed animal feeding stuff.

This method for producing the liquid oils and fats for animal feeding stuff comprises: a first washing process of heating fish oil with an acid value of 20 or lower, and rinsing the product by using water or hot water that is lowered in temperature by 10C or higher; an alkali treatment process of bringing the washed fish oil into contact with an alkaline solution; a second rinsing process of separating the alkali-treated oil followed by heating, and washing the product by using hot water, lowered in temperature by 10C or more; a dehydrating process of heating the washed oil to make the moisture evaporate; an adsorption treatment process of adding activated carbon and activated clay to the dehydrated oil, followed by stirring treatment, and absorbing and removing toxic substances; and a filtering process of filtering for adsorption treating the oil and separating the activated carbon and the activated clay.