Adjustable constant-current stopper

The utility model relates to an adjustable constant-current stopper for testing a water injection well in the oil extraction. The lower part of a salvaging head on the constant-current stopper is arranged in a shell, a regulating rod is fixed at the lower end, and threads in the lower part of the regulating rod are matched with threads of a regulating sleeve; a spring guide sleeve is arranged at the lower head face of the regulating rod, a compression spring is arranged in the spring guide sleeve, and the lower end of the compression spring is clamped in a bayonet in the upper head face of a mobile valve; a sealing packing sleeves the outer wall of the regulating sleeve, and a water inlet is formed in the regulating sleeve wall; a water outlet is formed in a jacket. The adjustable constant-current stopper is capable of realizing the constant-current water injection for the water injection well of an oilfield, changing the size of a water nozzle and realizing test regulation through repeated throwing and salvaging, saving the labor force, lowering the test cost and improving the water injection pass percent.