The invention provides a metal-based water treatment material and a preparation method thereof. The metal-based water treatment material is prepared according to the following steps: (1) mixing graphite oxide and water to be put into an ultrasonic instrument for ultrasonic oscillation; (2) mixing ferrous chloride, nano titanium dioxide, graphene oxide, sodium dehydroacetate, citric acid, potassium sorbate and ascorbic acid palmitate, and leaving to stand at the room temperature; (3) mixing sodium hydroxide and residual water so as to prepare a sodium hydroxide solution; (4) slowly adding the sodium hydroxide solution, and stirring by using a high-speed stirring machine till the sodium hydroxide solution is completely dripped; (5) adding 2-methyl furoate, hydrazine hydrate and glycerol, and stirring in a water bath; (6) filtering, washing for several times with distilled water, and drying in a vacuum drying oven at 50-70 DEG C, thereby obtaining the metal-based water treatment material. The metal-based water treatment material provided by the invention is capable of completely degrading 2,4-dichlorophenol, and meanwhile is rapid in degradation speed, and in addition, the adsorption rate to heavy metallic ions Gu<2+> is also up to 100%.