The invention discloses osmanthus jam and a preparation method thereof. The osmanthus jam is prepared from the following raw materials in parts by weight: 20-40 parts of osmanthus, 500-600 parts of pear, 30-50 parts of fructus crataegi, 60-80 parts of lemon juice, 150-250 parts of maltose, 30-50 parts of white granulated sugar, 20-40 parts of jelly powder and 500-600 parts of water. The preparation method comprises the following steps of: (1) peeling a lemon, removing seeds, and squeezing to obtain lemon juice; (2) peeling a pear, removing the core, and cutting into blocks; (3) peeling fructus crataegi, removing the core, cutting into blocks; and (4) putting the osmanthus into water for boiling out, boiling with soft fire for 10-15 minutes, taking the osmanthus out, adding the jelly powder, maltose and white granulated sugar, boiling with stirring to the completely dissolving state, adding the lemon juice, pear and fructus crataegi, boiling with stirring till the jam is thick, bottling, sealing, cooling, and putting into a refrigerator for preserving to obtain the osmanthus jam. The osmanthus jam smells fresh and tastes fine, soft, sour, sweet and delicious, and has the effects ofrefreshing, moisten the throat, moistening the skin and stimulating appetite and digestion.