The invention discloses an extracting method of persimmon fruit pectin and belongs to the technical field of processing of agricultural products. The extracting method takes astringent persimmon fruits, which are completely deastringented, as raw materials; the astringent persimmon fruits are extracted by adopting an ultrasonic-assisted acid extracting method. The extracting method comprises the following steps: deastringenting the persimmon fruits; carrying out ultrasonic-assisted acid extraction; cooling and filtering; carrying out ethanol precipitation; purifying and drying. With the adoption of the extracting method, the extracting rate of the persimmon fruit pectin can be improved, and high-quality high-methoxy pectin can be provided for the market; a new way for processing and utilizing the persimmon fruits is provided and the commodity value of the persimmon fruits can be greatly improved.