The invention relates to a method utilizing an indicative curve for testing and adjusting an oilfield water injection well, which mainly solves the problem of high cost of the existing test and adjustment of a water well. The method is characterized in that two tests are respectively and sequentially carried out according to the whole well injection allocation amount and 150 percent of injection allocation amount; according a flowing pressure value and a flow capacity value gained through the tests, an overflowing pressure loss value is checked out to gain a stratum average pressure figure and a moisture absorption coefficient of the stratum in contrast with a technologically designed water nozzle curve picture board ; when one water nozzle is kept unchanged and the injection allocation amount satisfies the geology requirements, the water nozzle curve picture board is checked to gain the overflowing pressure loss value, and then the flowing pressure value and the overflowing pressure loss value in front of the water nozzle of the layer section are obtained, and finally, the diameter of the water nozzle are obtained. The method can realize fast test and adjustment, does not change the original water injection pipe column technology and the water injection technology, and has no cost input.