Formaldehyde removal gel and preparation method thereof

The invention discloses a preparation method of formaldehyde removal gel, which comprises the steps of S1, at room temperature, dissolving and mixing a first component with deionized water or dispersing the first component with deionized water to obtain a first solution; S2, heating the first solution to 75-85 DEG C, and uniformly stirring the first solution at the temperature of 75-85 DEG C to obtain a second solution; S3, mixing the deionized water and sodium carbonate powder to obtain a first mixture; S4, mixing the second solution and the first mixture at the temperature of 60 DEG C to obtain a second mixture; S5, sequentially adding a chlorine dioxide precursor, a pigment, a preservative and glycerol into the second mixture, and stirring until the mixture is uniform; and S6, cooling to the temperature of 50 DEG C, and loading a sample to obtain the formaldehyde removal gel. The formaldehyde removal gel has various colors, the colors are kept stable, and meanwhile, formaldehyde in indoor air can be effici