Scale cleaning device for transportation pipeline of underwater oil well

The utility model discloses a scale cleaning device for an underwater oil well output pipeline, and relates to the technical field of pipeline scale cleaning. The device specifically comprises a first shell, a second shell is fixedly connected to the outer surface of the first shell, an inner pipe is arranged in the second shell, a spray pipe is fixedly connected to one end of the inner pipe, nine nozzles are formed in the outer surface of the spray pipe, and three barrier strips are rotationally connected to the outer surface of the spray pipe; according to the utility model, parts such as the barrier strip and the limiting ring are arranged, and the barrier strip and the limiting ring are matched with each other, so that the barrier strip can slide on the outer surface of the spray pipe to shield one part of the nozzles, and the water flow pressure intensity of the rest of the nozzles is increased; and therefore, the effect that the water flow pressure intensity of a nozzle can be changed by arranging a bar