Oil field underground water injection pipe

The utility model discloses an oil field underground water injection pipe, and relates to the technical field of oil field underground water injection pipes. The oil field underground water injection pipe comprises a water injection pipe body, a first pressure reducing device is arranged on the left side of the water injection pipe body, a second pressure reducing device is fixedly connected to the right side of the water injection pipe body, and the first pressure reducing device and the second pressure reducing device are the same in structure; a first pressure relief device, a first supporting rod, a center pressure relief device, a second supporting rod and a second pressure relief device are sequentially and fixedly connected to the right side of the protection outer plate from top to bottom, a first transmission pressure relief mechanism is arranged on the right side of the first supporting rod, and a second transmission pressure relief mechanism is arranged on the right side of the second supporting ro