The invention discloses a stewed pear syrup and a preparation method thereof. The stewed pear syrup is prepared by using 100 parts by mass of a concentrated pear juice, 9-13 parts by mass of a Corsvenor Momordica Fruit concentrate and 25-35 parts by mass of water. The preparation method comprises the following steps: uniformly mixing above components to form a pear syrup, carrying out a boiling concentration process until the Baume degree is 69-71Brix, cooling, sterilizing, cooling, filtering, and filling to obtain a final product with the Baume degree of 69-71Brix, that is, the stewed pear syrup. The concentrated pear juice in the concentrated fruit juice industry is introduced to substitute traditional fresh pears as a raw material for the stewed pear syrup, and can be stored for a long time, so the stewed pear syrup can be produced at all seasons; the concentrated pear juice has high cycle of concentration, so a long boiling concentration time is avoided when in use; and the concentrated pear juice is a concentrated fruit juice prepared from pears, is same to the pear juice in components, has no influences on the use of the concentrated pear juice in the stewed pear syrup as a raw material, has good mouthfeel and is beneficial to the human body.