Wellhead gas source purifier

The utility model relates to a well mouth air source purifier. The technical scheme is as follows: the device comprises a gas source inlet, a rotational flow dehydration pipe, a desulfurization and dust removal pipe, a purified gas outlet and a bottom plate seat, wherein the rotational flow dehydration pipe and the desulfurization and dust removal pipe are arranged on the bottom plate seat; an airsource inlet is formed in the lower half part of the rotational flow dehydration pipe; a purified gas outlet is formed in the top of the rotational flow dehydration pipe; a water condensation cap isarranged in an inner cavity of the rotational flow dehydration pipe; wherein the lower side of the rotational flow dehydration pipe is connected to desulfurization gas inlets of two or more desulfurization and dust removal pipes through a dehydration gas outlet, a sleeve type filter screen is arranged in an inner cavity of each desulfurization and dust removal pipe, and the top of each desulfurization and dust removal pipe