The utility model relates to an oil -field auxiliary device, including dosing tank and dosing pump, dosing tank and dosing pump are located the common base, and the dosing pump is located the place ahead of dosing tank, and the top of dosing pump is equipped with the switch board, the top of switch board and the top parallel and level of dosing tank, and the entry of dosing pump links to each other with the bottom of dosing tank. The dosing pump is the plunger pump, and the level gauge is installed to the lateral wall of dosing tank, and the level gauge includes low liquid level sensor, and heating rod and temperature controller are installed to the lower part of dosing tank. Dosing pump and heating rod are controlled by control system, and control system installs in the switch board. This oil -field auxiliary device volume and area are little, and mobility is good, and that can satisfy high casing pressure oil well adds the medicine demand, when the liquid medicine whereabouts when hanging down the liquid level, can make the work of dosing pump automatic shutdown, can carry out self -heating to the liquid medicine when medicine liquid temperature is less than the setting value, long long during with the termination of pumping in the time of can also setting up with the medicine as required, the automation of realization dosing pump is opened and is stopped unmanned on duty.