The invention relates to a composition of a
disinfectant and a preparation method thereof, and belongs to the field of medicines for veterinary use. The liquid
disinfectant comprises 2 to 15 percent (W / V) of aldehydes, 0.6 to 1 percent (W / V) of biguanides, 0 to 15 percent (W / V) of
quaternary ammonium salt and the balance of carrier, and the total percentage of the materials is 100 percent. The preparation method comprises the following steps of: 1) adding 2 to 15 percent (W / V) of aldehydes into
purified water in an amount which is 40 to 70 percent of the total volume, and stirring uniformly; 2) adding 0 to 15 percent W / V of
quaternary ammonium salt and 0 to 3 percent (W / V) of
fatty alcohol-
polyoxyethylene ether into the mixture in the step 1), and stirring uniformly; 3) adding 1 to 3 percent (W / V) of
turpentine, 1 to 3 percent (W / V) of
terpineol and 0.6 to 1 percent (W / V) of biguanides into the mixture in the step 2), stirring uniformly, and regulating the pH value to between 3.0 and 7.0 by using glacial
acetic acid; 4) adding 0.01 to 0.1 percent (W / V) of chelant and 0.05 to 1 percent (W / V) of
corrosion inhibitor into the mixture in the step 3), adding the
purified water to the total amount, stirring uniformly, filtering and filling to obtain the composition. The
disinfectant has the advantages of high efficiency, no
irritation, small corrosivity and the like, is used for disinfection of
livestock and poultry environment, equipment and the like, and has a wide market prospect and a high market value.