The invention discloses a heat preservation rock wool board with sound absorption and noise reduction functions and a manufacturing method thereof, and belongs to the field of building materials. The rock wool board is manufactured from, by weight, 50-60 parts of iron ore, 10-12 parts of pyrrhotite, 10-15 parts of perlite, 12-16 parts of slag, 10-13 parts of glass, 5-8 parts of limestone, 6-8 parts of a water repellent, 5-6 parts of urea, 8-10 parts of phenolic resin, 1-2 parts of 3-aminopropyltriethoxysilane and 3-5 parts of vinyl tri-tert-butyl peroxide silane. In the manufacturing process of mineral fiber, a certain amount of water repellent, adhesives and other auxiliaries are added, so that the fiber forming effect is good, the fiber distribution is uniform, the fiber structure is compact, the pressed rock wool board has the reasonable density gradient, and the good sound absorption and noise reduction functions are achieved.