The invention relates to the technical field of daily-use chemical products processing, in particular to a wild passion fruit liquid soap preparation method. The wild passion fruit liquid soap is prepared from the following raw materials: wild natural passion fruit oil, liquid sodium hydroxide, oleoyl, fatty alcohol-polyoxyethylene ether, sodium chloride, glycerol and deionized water. According to the technical scheme of the invention, the main raw material is passion fruit oil prepared by refining wild passion fruit on Gaoligong Mountains, and Tengchong County, Longyang District, Longling County and Changning County of Baoshan City are main producing areas of wild passion fruit oil, and the wild passion fruit oil is also distributed in Luxi City and Yingjiang County of Dehong Prefecture nearby; the wild passion fruit oil is a renewable resource, and liquid soap prepared from the wild passion fruit oil has the advantages of being high in detergency, rich in foam, easy for rinsing, power-saving, water-saving, antistatic, gentle and agreeable in hand feeling, energy-saving and environment-friendly. No essence is added to the liquid soap, so that natural fresh scent of the wild passion fruit is kept. The method complies with the energy-saving and environment-friendly requirements of China, and is an important measure for building a saving type harmonious society.