Right supporting and toxin eliminating oral liquid and preparation method of oral liquid

The invention belongs to the technical field of medicine for animals, and particularly relates to right supporting and toxin eliminating oral liquid, which is prepared from the following raw material medicine in percentage by weight: 40 percent of isatis root, 40 percent of astragalus and 20 percent of epimedium herb. A preparation method of the oral liquid comprises the following steps that the raw material medicine is proportionally taken and is crushed into coarse powder, water accounting for 10 to 12 times of the weight of the raw material medicine is added, in addition, the pH is regulated to 2.0 to 3.0 by hydrochloric acid, the reflux extraction is carried out for 0.5 to 1 hour, next, the pH is regulated to 5.5 to 6.5 by sodium bicarbonate, the reflux extraction is carried out for 0.5 to 1 hour, the extraction liquid is concentrated to 1 to 2 times of the raw material medicine through pressure reduction after being filtered, then, clear liquid is obtained after the membrane separation, preservatives are