The invention discloses a fluorine methyl -containing compound and a preparation method thereof. The fluorine methyl-containing compound is as shown in a formula C, R is a group containing an aryl group, or a group containing a heteroaryl group, the aromatic carbon atoms on the aryl group or the heteroaryl group are connected with CFmHn, m is 1 or 2, and m + n is equal to 3. The compound is difficult to prepare according to the prior art, raw materials and a catalyst of the preparation method are common industrial raw materials, and are cheap and easy to obtain, the preparation method is highin reaction efficiency, high in yield, simple in post-treatment, low in toxicity, environment-friendly, good in functional group compatibility, wide in broad-spectrum property, low in production costand good in market application prospect.