The invention discloses mango and passion fruit jam and a preparation method thereof. The jam comprises raw materials as follows: 10 parts of mango pulp by weight, 1-100 parts of peeled passion fruits by weight, 4-110 parts of a sweetening agent by weight and 0.5-10 parts of an acidulant by weight. The preparation method of the jam comprises steps as follows: (1) mangoes are selected, peeled and subjected to color protection for use; (2) passion fruits are selected, washed, frozen, unfrozen, peeled and soaked for preservation; (3) the mangoes are pulped or diced, the passion fruits are pulped and homogenized for use, mango pulp or dices are added to passion fruit pulp, and boiling concentration, seasoning, sterile canning, degassing and cold storage are performed. Peels of the passion fruits are effectively removed with a simple physical method of freezing and thawing. The jam which contains no additive and is sour, sweet, delicious and rich in nutrition is prepared from the mango pulp or dices as well as remaining peels, pulp and juice of the passion fruits; the production method is simple, economical, environment-friendly, suitable for mass industrial production and lower in production cost.