The invention discloses a water-soluble fullerene nano-material and a preparation method and applications thereof. The general structural formula of the water-soluble fullerene nano-material is C<2n>(OH)<x>(Amino Acid)<y>, wherein 20 <= n <= 60, 0 <= x < 50, 0 <= y < 20, and the Amino Acid is a water-soluble amino acid. The water-soluble fullerene nano-material can be applied to prepare medicinesof tumour treatment, the tumour is at least one kind of the following diseases: liver cancer, lung cancer, colorectal cancer, kidney cancer, pancreatic cancer, osteocarcinoma, mammary cancer, ovariancancer, prostatic cancer, esophageal cancer, gastric cancer, oral cancer, nasal cancer, laryngocarcinoma, cholangiocarcinoma, cervical carcinoma, uterine cancer, testicular cancer, meningioma, skin cancer, melanoma and sarcoma. The material has good water solubility and good endophilicity with organisms, and can obviously block tumor vessels and rapidly cut off nutritional supply of tumor tissues;and the material is low in preparation costs.