The invention discloses a Penicillium, a preparation method and applications thereof, Penicillium fungus PSM11-5 is separated from a vanadium ore sample; insoluble tricalcium phosphate, sodium metavanadate, cobalt hydroxide and basic nickel carbonate are taken as indicating compounds; and a fungal strain is screened by testing the capability of decomposing the tricalcium phosphate, the sodium metavanadate, the cobalt hydroxide and the basic nickel carbonate. The Penicillium PSM11-5 is Penicillium sp.PSM11-5 CCTCCM208207. The strain is utilized for carrying out biological leaching of phosphorus and biological metallurgy, metals of phosphorus, vanadium, nickel, cobalt and the like are leached from lean ores, discarded ores, submarginal ores, difficult-to-mine ores, difficult dressing ores and refractory ores, thereby fully utilizing the mineral resources, reducing the metallurgical costs and protecting the ecological environment. The PSM11-5 is utilized for leaching the phosphorus from low-grade phosphate rock powder, a biological fertilizer is prepared to be applied to the soil, thereby leading the soil to contain higher content of soluble phosphorus which can be utilized by crops; the strain further leaches insoluble phosphorus which is deposited in the soil before, thereby reducing phosphorus fertilizer and reducing gas pollution caused by the phosphorus fertilizer and water pollution caused by the phosphorus fertilizer.