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This utility model relates to a gas wellhead chemical dosing device, belonging to the field of gas wellhead chemical dosing. The device includes a tank for holding the chemical agent; the upper part of the tank is equipped with a dosing pipeline and a venting pipeline; the lower part of the tank is equipped with a chemical outlet pipeline for connection to the wellhead; and the upper part of the tank is also equipped with a pressurization pipeline for connection to a casing test valve. This device utilizes the energy of the gas in the gas well and the gravity of the chemical agent to achieve dosing, eliminating the need for additional pressurization equipment, making it convenient to operate and implement.