An isolated porcine placenta extraction method, the method is based on pig placenta as raw material, high-speed tissue homogenates, cold low-frequency ultrasonic assisted extraction, high-speed centrifugation and IOKDa frozen ultrafiltration membrane to obtain low molecular weight pig placenta Su solution, and then after microwave vacuum freeze-dried to obtain a solid pig placenta products, related to research and development in the field of health food low temperature ultrasonic extraction process and microwave vacuum freeze-drying process, belong