The utility model relates to a device for an anaerobic preparation and anaerobic preservation oil field injection system. The device for the anaerobic preparation and anaerobic preservation oil field injection system comprises a vacuum pump, a first conical bottle, a second conical bottle, a first three-way valve, a second three-way valve, a third conical bottle, a bucket, a nitrogen bag, an ampoule bottle and a blowtorch, wherein the vacuum pump, the first conical bottle, the second conical bottle and the first three-way valve are connected through a first rubber pipe channel, the first three-way valve and the second three-way valve are connected through a second rubber pipe channel, the first three-way valve and the third conical bottle are connected through a third rubber pipe channel, the second three-way valve and the third conical bottle are connected through a fourth rubber pipe channel, the nitrogen bag and the third conical bottle are connected through a fifth rubber pipe channel, the bucket and the third conical bottle are connected through a sixth rubber pipe channel, the second three-way valve and the ampoule bottle are connected through a seventh rubber pipe channel, and the blowtorch is arranged on a bottle neck portion of the ampoule bottle. The device for the anaerobic preparation and anaerobic preservation oil field injection system can control dissolved oxygen in a lower degree during preparation and preservation process, and enables evaluation results to be more accurate.