The invention provides a prasugrel compound and a new preparation method thereof. The new preparation method comprises the following steps: carrying out hydrolysis reaction on a prasugrel crude product to obtain a prasugrel precursor intermediate, adding activated carbon for adsorbing and purifying, and then, carrying out esterification reaction under the catalysis of strong acid salt catalysts to obtain the high-purity prasugrel. The invention has the advantages of simple reaction steps, high yield, low cost and high product purity.