Beam-pumping unit power-aid wellhead chemicals-feeder

The utility model relates to a well head chemical feeding device for oil exploitation, particularly a well head chemical feeding device boosted by a pumping unit. The utility model provides the well head chemical feeding device for oil exploitation for overcoming the shortages of the existing well head chemical feeding devices, such as requirements for special motive power, large occupation area, complex pipe connection, etc. The well head chemical feeding device for oil exploitation mainly comprises a chemical containing box (12), a plunger pump (8), a pressing arm (5), a fixing bracket (9), a level gauge (11), etc.; a clamping block (4) is installed on a polished rod (3) of the pumping unit; the plunger pump (8) is installed on the chemical containing box (12); one end of the pressing arm (5) is connected with the fixing bracket (9) through a pin shaft (16); the middle part of the pressing arm (5) is positioned on the upper end of a plunger piston of the plunger pump (8); when the clamping block (4) falls down, the clamping block can drive the front end (13) of the pressing arm to move downwards, so that the plunger piston inside the plunger pump (8) and the polished rod (3) of the pumping unit can move in the same direction. The utility model has the advantages of energy conservation, reasonable and simple structure, few wearing part, and convenience for operation and maintenance.