The utility model discloses a gas-liquid separator-filter for wellhead associated gas, which is designed for removing moisture and solid impurities in the associated gas, and meeting the supercharging requirement of a compressor. A barrel of the filter is fixed at a support; a connecting pipe is connected to an ellipsoidal head which is connected to the bottom end of the barrel; a flange port and a gas-liquid inlet are connected to the lower part of the barrel; a differential pressure gauge pipe mouth, a pressure gage pipe mouth and a silk screen barrel are connected to the upper part of the barrel; the bottom surface of a support plate in the barrel is connected with a liquid discharge pipe and a baffle plate which is corresponding to the gas-liquid inlet; an overflow plate which is inclined is arranged below the gas-liquid inlet; a filter piper is connected to the top surface of the support plate; a horizontal hanging cover quick-opening blind plate is connected to the top of the barrel. According to the gas-liquid separator-filter for wellhead associated gas, the separation and filter functions are integrated, and the gas-liquid separator-filter is suitable for separation of the wellhead associated gas in an oil field, and is capable of removing the moisture and few solid impurities in natural gas so as to meet the supercharging requirement of the compressor. The gas-liquid separator-filter for wellhead associated gas is high in separation efficiency, reasonable in structure, low in manufacturing cost, and obvious in economic benefits.