The invention relates to the field of water treatment and discloses a preparation method of a nickel metal-organic framework material for adsorbing water-borne pollutants. The method comprises mixingnickel hydroxide and hexafluorosilicic acid aqueous solution for stirred reaction to obtain a green mixture; suction-filtering the green mixture to obtain green nickel hexafluorosilicate aqueous solution, and performing recrystallization to obtain green nickel hexafluorosilicate crystal; mixing the methanol solution of the nickel hexafluorosilicate crystal with the methanol solution of 2-mercaptopyrazine, heating the mixture for self-assembling reaction, and then cooling down to room temperature to obtain a yellow sample; suction-filtering the yellow sample to obtain the sulfhydrylated metal-organic framework material. According to the preparation method of the nickel metal-organic framework material for adsorbing the water-borne pollutants, by performing sulfydryl modification on a metal-organic framework, the advantages of various components can be given full play to, collaboration on properties can be achieved, and the prepared nickel metal-organic framework material for adsorbing the water-borne pollutants has the advantages of being numerous in active group sites, good in absorptive property, simple in preparation and the like and is a heavy metal adsorbing material with a good development prospect.