The invention discloses a manufacturing technology of a water spray cooling ring. The manufacturing technology is simple in manufacturing technology and low in manufacturing cost and comprises steps as follows: step one, an inwards recessed circular-ring-shaped groove is formed in each of the upper surface and the lower surface of a circular-ring-shaped forge piece in a milling manner, the two circular-ring-shaped grooves can be combined correspondingly and are concentric with the circular-ring-shaped forge piece; step two, the circular-ring-shaped forge piece is cut into two parts in the diameter direction of the circular-ring-shaped forge piece, so that the circular-ring-shaped forge piece is divided into two split circular-ring-shaped forge pieces provided with the circular-ring-shaped grooves respectively; step three, the two circular-ring-shaped grooves in the two split circular-ring-shaped forge pieces are combined correspondingly, then weld sealing is performed, accordingly, a water spray cooling ring body is formed, and a closed water inlet cavity is formed by the two circular-ring-shaped grooves; step four, a plurality of water spray holes are formed in the inner wall of the water spray cooling ring body in a drilling manner, and the water spray direction of each water spray hole is downwards inclined; step five, a water inlet communicated with the water inlet cavity is formed in the outer wall of the water spray cooling ring body in a drilling manner and is welded with a water inlet pipe.